People v. Deen: Trial Courts Must Independently Determine Juror Actual Bias Under CCP § 225 (Not Defer to Juror Assurances), Reading CCP § 229(f) Together With § 225

1. Introduction

People v. Deen (Cal. Apr. 6, 2026, S092615) is a California Supreme Court automatic appeal from a capital judgment. Omar Richard Deen was convicted of murdering his mother, Rachel Deen, and Calipatria Police Chief J. Leonard Speer with a firearm. The jury found true special circumstances (financial gain as to Rachel Deen; murder of a peace officer in the performance of duties as to Chief Speer) and returned a death verdict.

The trial proceeded in four phases—competency, guilt, sanity, and penalty. The competency phase was tried before a different judge and jury. On appeal, the Court did not reach most asserted claims because it found reversible jury-selection error: the trial court denied a defense for-cause challenge to a prospective juror (who ultimately sat as Juror No. 5) based on a mistaken view that it was legally “stuck” accepting the juror’s assurances of impartiality.

The key issue was not whether Juror No. 5 actually behaved improperly at trial, but whether the trial court applied the correct legal standard and exercised its own judgment in assessing potential bias, especially where the juror had meaningful ties to the murdered police chief, had received case details from law enforcement sources, and knew numerous potential witnesses.

2. Summary of the Opinion

The Court held that the trial court committed reversible error by denying the defense for-cause challenge to Juror No. 5 after applying an unduly narrow understanding of its authority under the jury-challenge statutes. The trial judge focused on Code of Civil Procedure section 229 (implied bias) and repeatedly stated it could not excuse the juror for cause so long as the juror said he could be fair and the judge had no reason to disbelieve him.

The Supreme Court clarified that sections 225 and 229(f) require an inquiry into a juror’s state of mind and that trial courts must make an objective, totality-of-circumstances determination of whether a juror can act with “entire impartiality” under section 225, subdivision (b)(1)(C). Because the trial court misunderstood this duty and failed to make the required finding(s) under the correct standard, a juror “who had not been properly evaluated as the law requires sat on defendant’s case.”

Disposition: The judgment was reversed in its entirety and the matter remanded for trial de novo, encompassing all phases including competency.

3. Analysis

3.1. Precedents Cited

Voir dire procedure and court-controlled questioning

  • Tapia v. Superior Court (1991) 53 Cal.3d 282 and People v. Beck and Cruz (2019) 8 Cal.5th 548: The Court referenced these to situate the case in the Proposition 115 regime (former CCP § 223), under which the court primarily conducts voir dire and questioning is limited to aiding challenges for cause. This procedural framework heightened the trial judge’s responsibility to ensure the record is adequately developed on bias-related concerns, because counsel’s ability to probe may be constrained unless “good cause” is shown.

Constitutional impartial-jury principles

  • People v. Thomas (2011) 51 Cal.4th 449: Cited for California’s independent constitutional guarantee of an impartial jury (Cal. Const., art. I, § 16).
  • People v. Mataele (2022) 13 Cal.5th 372: Quoted for the proposition that defendants are entitled to jurors who “set aside preconceptions, disregard extrajudicial influences, and decide guilt or innocence based on the evidence presented in court,” and for the point that the Witt standard is consistent with the state constitutional guarantee.

Statutory bias framework and the limits of “implied bias”

  • People v. Ledesma (2006) 39 Cal.4th 641: Central to the Court’s statutory analysis. Ledesma is invoked to reaffirm that “implied bias” exists only for the enumerated causes in CCP § 229, but also that if § 229 does not apply, a juror may still be excused for actual bias under CCP § 225 if the juror’s state of mind would prevent impartiality. Deen uses Ledesma to correct the trial court’s mistaken conclusion that failing to fit within a § 229 category effectively forecloses for-cause excusal.
  • United States v. Wood (1936) 299 U.S. 123: Cited to define implied bias as “bias conclusively presumed as a matter of law,” reinforcing the categorical nature of many § 229 grounds—and highlighting why those categories do not exhaust the universe of bias concerns.

Trial-court role in evaluating demeanor/credibility; deference on review

  • Wainwright v. Witt (1985) 469 U.S. 412: A key analog. Although Witt addresses death-qualification, Deen draws from Witt’s practical guidance: the trial judge may form a “definite impression” a juror cannot apply the law, and bias need not be proven with “unmistakable clarity.” Deen repurposes Witt’s insight to explain how trial courts should approach the state-of-mind inquiry under CCP § 225 and § 229(f) (which also turns on state of mind).
  • People v. Alvarez (1996) 14 Cal.4th 155 and People v. McPeters (1992) 2 Cal.4th 1148: Cited for the proposition that demeanor and credibility determinations are peculiarly within the trial judge’s province and, absent clearly apparent bias, the trial judge is best positioned to assess a prospective juror’s state of mind on voir dire.
  • People v. Baker (2021) 10 Cal.5th 1044: Provides the articulated appellate posture: deference applies if the correct standard was used and the decision is supported by substantial evidence. Deen adopts this framework to underscore that appellate courts defer to trial courts only when trial courts actually exercise their judgment under the proper legal standard.
  • People v. Silveria and Travis (2020) 10 Cal.5th 195: Cited for the substantial-evidence review of factual findings underlying for-cause rulings.
  • Horsford v. Board of Trustees of California State University (2005) 132 Cal.App.4th 359: Used to explain “abuse of discretion” where a court transgresses legal principles. Deen characterizes the error as the court’s failure to exercise discretion within the correct legal framework—rather than a mere disagreement with the result.

Totality-of-circumstances evaluation of “actual bias”

  • In re Manriquez (2018) 5 Cal.5th 785: Cited for the idea that what constitutes actual bias varies with the circumstances, supporting Deen’s totality approach rather than a checklist tied only to categorical implied-bias factors.
  • People v. Ramirez (2022) 13 Cal.5th 997 and People v. Lewis (2008) 43 Cal.4th 415: Cited to reinforce that even where a juror offers assurances of fairness, the “ultimate question remains with the court.”
  • People v. Tate (2010) 49 Cal.4th 635: Cited for the proposition that the trial court may consider the entirety of the examination in deciding whether excusal is justified.

Special challenges in homicide and capital jury selection; resolving doubt

  • People v. Tidwell (1970) 3 Cal.3d 62: Invoked as a cautionary lens on the difficulty of securing impartial adjudication where jurors are familiar with homicide victims—amplified in capital cases where jurors face the life-or-death choice.
  • People v. Ruef (1910) 14 Cal.App. 576: Quoted approvingly for a “safe rule”: if the trial judge is doubtful whether a juror can discard opinions and try the case fairly, the judge should resolve the doubt against the juror and excuse him. Deen elevates Ruef as practical guidance for trial judges confronting close bias calls.

Scope of remand / competency included

  • People v. Mickle (1991) 54 Cal.3d 140: Cited to confirm that the competency phase, though assigned a different case number below, is part of the case on appeal and is encompassed by the reversal and remand.

Concurring opinion: Eighth Amendment trajectory re severe mental illness

  • Atkins v. Virginia (2002) 536 U.S. 304 and Roper v. Simmons (2004) 543 U.S. 551: Justice Groban cited these as analogues for categorical exemptions from capital punishment (intellectual disability; juveniles), emphasizing “diminished capacities,” reduced deterrence/retribution rationales, and “evolving standards of decency.”
  • People v Mendoza (2016) 62 Cal.4th 856: Cited for California constitutional cruel-or-unusual analysis considering “mental capabilities” and the idea that some mentally ill offenders may lack the extreme culpability associated with capital punishment; also referenced in the concurrence’s broader discussion of future categorical limits.
  • Harmelin v. Michigan (1991) 501 U.S. 957 and People v. Zimmerman (1984) 36 Cal.3d 154: Cited for the principle that “death is different,” supporting the concurrence’s argument that severe mental illness may require heightened substantive limits beyond competency and insanity doctrines.
  • The concurrence also cited numerous California capital cases discussing schizophrenia/psychosis evidence (including People v. Helzer (2024) 15 Cal.5th 622, People v. Johnson (2022) 12 Cal.5th 544, People v. Steskal (2021) 1 1 Cal.5th 332, People v. Miles (2020) 9 Cal.5th 513, People v. Johnson (2019) 8 Cal.5th 475, People v. Potts (2019) 6 Cal.5th 1012, People v. Powell (2018) 5 Cal.5th 921, People v. Ghobrial (2018) 5 Cal.5th 250, People v. Cage (2015) 62 Cal.4th 256, People v. Hajek and Vo (2014) 58 Cal.4th 1144, People v. DeHoyos (2013) 57 Cal.4th 79, People v. Blacksher (2011) 52 Cal.4th 769, People v. Weaver (2001) 26 Cal.4th 876, People v. Medina (1995) 11 Cal.4th 694, People v. Kelly (1992) 1 Cal.4th 495), not as controlling holdings here but to situate Deen within a “familiar pattern” of death cases involving severe mental illness evidence.

3.2. Legal Reasoning

The majority’s reasoning is a methodological correction about how trial courts must decide for-cause juror challenges when bias is not conclusively presumed by statute.

(a) The trial court’s core mistake: collapsing the inquiry into juror assurances

Juror No. 5 presented multiple bias-relevant facts: prior law-enforcement employment; personal acquaintance with Chief Speer; having coffee with him; campaigning for him; describing a “friendship”; intending to attend the funeral; hearing “details” from police sources; and knowing 14 listed police witnesses. The juror also wrote “Yes” when asked whether he would have difficulty keeping an open mind and whether killing a police officer would prevent him from being fair and impartial.

Yet the trial court treated the inquiry as essentially governed by CCP § 229’s enumerated implied-bias categories and reasoned that, unless it disbelieved the juror’s assurances, it had no authority to excuse him. It repeatedly described itself as “begging” for authority and “stuck” with the proposition that “if a juror said they could be impartial, follow the law, that’s good enough.”

(b) The Supreme Court’s correction: read CCP § 225 and § 229(f) together; make an objective totality determination

Deen explains that the statutory framework is “complementary.” CCP § 229 specifies when bias is conclusively implied “for one or more of the following causes, and for no other,” but it does not “undermine or supplant” the separate inquiry into actual bias under CCP § 225(b)(1)(C). Further, CCP § 229(f) itself requires a state-of-mind inquiry (“enmity” or “bias”), reinforcing that not all bias determinations are simple categorical fact checks.

The Court thus imposed a clear decision rule: when a for-cause challenge raises substantial bias concerns not covered by a categorical implied-bias ground, the trial court must independently decide whether the juror can act with “entire impartiality” by considering the totality of circumstances—statements, hesitations, relationships, sources of extrajudicial information, and (where relevant) demeanor and credibility. A juror’s self-assessment matters, but it is not dispositive.

(c) The appellate consequence: inability to defer where the court failed to exercise judgment under the correct standard

Deen is careful about the posture of review. Ordinarily, appellate courts defer to trial judges’ credibility and demeanor-based findings, and uphold for-cause rulings supported by substantial evidence. But that deference presupposes the trial court applied the correct standard and actually made the findings the law requires.

Here, the Supreme Court found the record showed the trial court did not do that: it treated itself as legally bound by juror assurances and failed to “make the findings required of it.” Because a juror “who had not been properly evaluated as the law requires sat on defendant’s case,” the error required reversal of the entire judgment.

(d) Record development as part of the duty

The Court also emphasized that trial courts must ensure an adequate record for appellate review by conducting—or permitting—sufficient voir dire to clarify circumstances bearing on state of mind. Where inquiry is lacking (or constrained), decision-makers may fall back on “preconceived notions or unsupported deductions” rather than an individualized evaluation.

3.3. Impact

(a) Practical rule for trial courts in California

People v. Deen clarifies that, in ruling on for-cause challenges, trial courts may not treat juror assurances (“I can be fair”) as legally conclusive. Even if the trial judge believes the juror is sincere, the court must still make an objective totality-of-circumstances determination under CCP § 225(b)(1)(C) (and § 229(f) where invoked) about whether the juror can act with entire impartiality.

(b) Increased focus on relationships + extrajudicial “detail” from insiders

The opinion flags as “particularly significant” circumstances where a juror is personally acquainted with a victim, party, or witness, or has received “detailed information about the case from prospective witnesses.” In communities where victims (especially law-enforcement victims) are widely known, Deen supplies a structured way to separate general awareness from bias-relevant exposure.

(c) Appellate review: deference has predicates

Deen reinforces that appellate deference depends on (1) the correct legal standard and (2) a record and findings that show the trial court actually exercised the judgment the law demands. Where a trial judge frames the decision as an absence of authority and fails to apply CCP § 225’s actual-bias standard, reversal may follow even without a finding that the seated juror actually acted improperly.

(d) Capital context: error has case-wide consequences

The case also illustrates the structural nature of jury-selection error in capital trials: because the same jury proceeds through guilt and penalty (and because juror impartiality underlies the entire adjudication), the Court reversed “the judgment in its entirety” and ordered a trial de novo.

(e) Concurring opinion’s forward-looking pressure point

Justice Groban’s concurrence does not change the holding, but it signals an emerging doctrinal and legislative question: whether “evolving standards of decency” will require a categorical bar on executing persons with severe mental illness, analogous to Atkins and Roper. While expressly reserved, the concurrence frames severe mental illness as a recurring feature of California capital records and questions whether existing procedural mechanisms (competency, insanity, mitigation, competency to be executed) adequately protect against executions inconsistent with deterrence/retribution rationales.

4. Complex Concepts Simplified

Challenge for cause
A request to remove a prospective juror because the juror is legally unqualified—e.g., because of bias. Unlike a peremptory challenge, it requires a reason grounded in law.
Peremptory challenge
A limited-number strike allowing a party to remove a juror without stating a reason (subject to constitutional limits). In Deen, the defense had exhausted peremptories by the time Juror No. 5 was seated, heightening the practical importance of the for-cause ruling.
Implied bias (CCP § 229)
Bias the law conclusively presumes from certain enumerated facts (e.g., close familial relationship to a party or victim). If a category applies, the juror is disqualified “and for no other” implied-bias reasons.
Actual bias (CCP § 225(b)(1)(C))
A juror’s actual “state of mind” that would prevent “entire impartiality.” It is not presumed and must be assessed by the trial court based on the totality of the juror’s answers, circumstances, and (when relevant) demeanor.
CCP § 229(f) overlap
Although within the implied-bias statute, subdivision (f) turns on the juror’s “state of mind,” functionally requiring the same kind of evaluative judgment as an actual-bias inquiry. Deen’s key point is that failure to meet a categorical § 229 ground does not end the analysis.
“Definite impression” / “substantially impair” (Wainwright v. Witt)
A practical standard recognizing that juror bias is not always shown with “unmistakable clarity.” If the trial judge forms a definite impression that a juror cannot faithfully apply the law, excusal is proper. Deen uses this concept to illuminate how trial courts should approach state-of-mind determinations under California’s bias statutes.
Substantial evidence review
On appeal, factual findings are upheld if supported by evidence a reasonable factfinder could accept. Deen emphasizes that this deference depends on the trial court having applied the correct standard and having made the findings the law requires on a sufficient record.
Trial de novo on remand
A new trial from the beginning. Here, the Supreme Court reversed the entire judgment, including the competency phase, and sent the matter back for proceedings anew.

5. Conclusion

People v. Deen establishes an important operational principle for California jury selection: trial courts must not treat a prospective juror’s promise of fairness as legally dispositive. Instead, they must exercise independent judgment under CCP § 225(b)(1)(C)—and consistently with the state-of-mind inquiry in CCP § 229(f)—by applying an objective totality-of-circumstances assessment of whether the juror can act with “entire impartiality.”

The decision also underscores that an adequate voir dire record is part of the adjudicative duty: without clear inquiry and findings, appellate courts cannot meaningfully apply deference. In capital cases, where community ties to victims and witnesses may be pronounced and the stakes uniquely high, Deen’s insistence on an objective, court-owned bias determination functions as a structural safeguard for the constitutional right to an impartial jury.