Evidence-Based Alternative-Suspect Arguments May Not Be Removed from the Jury’s Consideration

Case: CARVALHO (KATRINA) v. STATE (CRIMINAL)

Citation: 142 Nev., Advance Opinion 62

Court: Supreme Court of Nevada

Date: October 1, 2026

Disposition: Conviction reversed and case remanded for a new trial before a different district court department.

Introduction

The Supreme Court of Nevada considered whether a trial court violated a criminal defendant’s due process rights by preventing defense counsel from arguing that another person may have committed the charged murder. Katrina Gabrielle Carvalho was convicted of first-degree murder with the use of a deadly weapon for the shooting death of Vintell Johnson.

Carvalho’s principal defense was that the evidence did not reliably identify her as the shooter and pointed equally toward other suspects, particularly her sister, Regina. During closing argument, however, the district court repeatedly prohibited counsel from suggesting that Regina might have fired the shots, instructed the jury not to consider Regina’s possible guilt, fined defense counsel $500, and threatened criminal contempt.

The central issue was the distinction between improperly asking a jury to adjudicate a third party’s guilt and permissibly arguing that evidence implicating an alternative suspect creates reasonable doubt about the defendant’s guilt. The Supreme Court held that Carvalho’s argument fell into the latter category and that the district court’s restrictions improperly removed her primary defense from the jury’s consideration.

Factual and Procedural Background

Carvalho, Regina, and Johnson argued while Carvalho and Regina were dropping Johnson off at his apartment complex. Jeremiah Tate testified that Carvalho was in the driver’s seat, Johnson was in the passenger’s seat, and Regina stood outside the passenger side. After Johnson pushed both sisters, Tate positioned himself between Johnson and the women. Tate then saw Carvalho pointing a gun. He took cover and, approximately five seconds later, heard gunshots. Johnson approached Tate, stated that “the bitch shot me,” and collapsed. He died from three gunshot wounds to the back.

Another witness, Yaneth Gonzalez, heard Johnson and Regina arguing and heard Johnson say, “Shoot me, shoot me,” before hearing gunfire. No witness testified to actually seeing who pulled the trigger.

Carvalho’s first trial ended in a mistrial after witnesses disclosed new evidence. At the second trial, Regina invoked her Fifth Amendment privilege against self-incrimination, and the State introduced portions of her earlier testimony. The State also introduced Gonzalez’s testimony from the first trial because she was medically unable to travel.

During closing argument, defense counsel maintained that the investigation was inadequate and that the evidence implicating Carvalho also implicated Regina. The district court stopped this argument three times, instructed the jury that it could not speculate about Regina’s guilt, sanctioned counsel, and threatened contempt. The jury convicted Carvalho, and she received a life sentence with parole eligibility after 28 years.

Summary of the Opinion

The Supreme Court of Nevada reached three principal conclusions:

  1. The alternative-suspect defense was improperly restricted. A defendant may not ask jurors to disregard the defendant’s guilt and instead decide whether someone else is guilty. But the defendant may argue, from evidence and reasonable inferences, that another person committed the crime and that this possibility creates reasonable doubt.
  2. The error was not harmless. The district court’s repeated admonitions, monetary sanction, threat of contempt, and jury instructions chilled defense counsel’s presentation and effectively removed Regina as an alternative suspect from the jury’s deliberations.
  3. Retrial is permitted. Carvalho’s constitutional and statutory speedy-trial claims failed because most delays were attributable to the defense. The evidence was also legally sufficient to support the conviction. Accordingly, the proper remedy was a new trial, not acquittal or dismissal.

Analysis

The Rule Established

A criminal defendant may use evidence that an alternative suspect committed the charged offense to establish reasonable doubt, even though the jury may not be asked to adjudicate that third party’s guilt. A trial court violates due process when its restrictions on closing argument effectively remove an evidence-based alternative-suspect defense from the jury’s consideration.

Precedents Cited

Right to Present a Complete Defense

Hoagland v. State, relying on California v. Trombetta, established that due process guarantees a criminal defendant a meaningful opportunity to present a complete defense. This principle supplied the constitutional foundation for the court’s decision.

Williams v. State supported the conclusion that improperly removing a defense theory from the jury’s consideration constitutes reversible error. Carvalho was not merely prevented from using a particular phrase; the trial court’s actions foreclosed her principal explanation of why the State had not proved identity beyond a reasonable doubt.

Permissible Scope of Closing Argument

Glover v. Eighth Jud. Dist. Ct., quoting United States v. Hoffman, recognizes that defense counsel must be allowed to argue all reasonable inferences arising from the record, while prohibiting arguments based on facts not in evidence. The Supreme Court concluded that Carvalho’s argument satisfied this requirement because neither Tate nor Gonzalez saw the actual shooting, and Regina was close enough to Carvalho that she could reasonably have taken the gun and fired it.

Dorsey v. State confirms that a defendant may argue that another person committed the charged crime. By contrast, Guy v. State prohibits asking jurors to consider someone else’s culpability instead of deciding whether the defendant is guilty. The court used these decisions to draw the controlling distinction:

  • Permissible: “The evidence supports the possibility that another person was the shooter, so the State has not proved the defendant’s guilt beyond a reasonable doubt.”
  • Impermissible: “Do not decide the defendant’s guilt; determine whether the other person is guilty.”

Carvalho’s counsel pursued the permissible argument. Counsel expressly acknowledged that Regina was not on trial and used her possible role only to challenge the State’s proof against Carvalho.

Scott v. State was applied separately to uphold the district court’s correction of defense counsel’s misstatements concerning first-degree murder. Thus, the Supreme Court did not eliminate judicial authority to police closing arguments; it held only that such authority cannot be used to suppress a lawful defense theory.

Standard of Review and Harmless Error

Under Glover v. Eighth Jud. Dist. Ct., trial courts generally possess broad discretion to regulate closing argument. Nevertheless, that discretion is abused when the court prevents counsel from presenting a legitimate defense grounded in the evidence.

Valdez v. State supplied the harmless-error standard: after a constitutional error, the State must establish beyond a reasonable doubt that the error did not contribute to the verdict. The State could not satisfy that burden. The court’s repeated interventions, sanction, and threat of contempt caused counsel to stop mentioning Regina, thereby depriving the jury of focused argument on the defense’s principal theory.

Speedy-Trial Authorities

Doggett v. United States and Barker v. Wingo provide the four-factor constitutional test: length of delay, responsibility for the delay, assertion of the right, and prejudice.

Sunseri v. State recognizes that a delay exceeding one year is presumptively prejudicial and identifies responsibility for the delay as the focal inquiry. Although Carvalho’s two-year delay crossed that threshold, three of the four delays resulted from defense actions: a preparation continuance, a request for new counsel, and a defense-requested mistrial.

Duckket v. State and Vermont v. Brillon establish that delays attributable to defense counsel, including those intended to protect the defendant’s rights, ordinarily count against the defendant. The remaining delay involved the court’s scheduling conflict. On balance, no constitutional violation occurred.

For the statutory claim under NRS 178.556(1), Oberle v. Fogliani, as later affected on other grounds by Clow v. Sheriff, provides that defendants responsible for delay beyond the statutory period may not complain of that delay. Carvalho therefore failed to establish a statutory violation as well.

Sufficiency of the Evidence and Remedy

Barber v. State requires reviewing the evidence in the light most favorable to the prosecution and asking whether any rational factfinder could find every element beyond a reasonable doubt. Mason v. State prevents an appellate court from reweighing evidence or reassessing witness credibility.

Under Stephans v. State, insufficient evidence would require acquittal. Here, however, Tate saw Carvalho point a gun, other witnesses corroborated portions of his account, and Carvalho fled to California after the shooting. A rational jury could infer intent and premeditation from the interval between the threat and the shots and from the three shots fired into Johnson’s back.

Because the evidence was sufficient and the reversal rested on trial error, Burks v. United States permitted retrial rather than acquittal. Finally, Williams v. Second Jud. Dist. Ct. supported assignment of the retrial to a different judicial department under the Supreme Court’s supervisory authority.

The court declined to address Carvalho’s remaining arguments under Smith v. State because reversal on the alternative-suspect issue made their resolution unnecessary.

Legal Reasoning

The decisive question was not whether Regina was actually guilty, but whether the trial evidence permitted a reasonable inference that someone other than Carvalho fired the shots. Neither key witness saw the trigger pulled. Tate placed Regina beside Carvalho shortly before the shooting, while Gonzalez heard Regina arguing with Johnson immediately before the shots. Those facts permitted defense counsel to argue that Regina might have obtained the gun and fired it.

The standard jury instruction—that jurors were deciding Carvalho’s guilt rather than anyone else’s—was legally correct in isolation. The error arose from the court’s additional statements that jurors could not consider whether Regina might have been the shooter and that suggesting another guilty party was improper. In context, these statements prevented jurors from considering evidence central to whether the State had proved Carvalho’s identity as the shooter.

The court also found it significant that the district court allowed counsel to identify Tate as a possible shooter while forbidding the same type of argument regarding Regina. This inconsistent treatment reinforced the conclusion that the court had selectively eliminated the defense’s strongest alternative-suspect theory.

Complex Concepts Simplified

Alternative-suspect defense
An argument that someone other than the defendant may have committed the crime, creating reasonable doubt about the defendant’s guilt.
Reasonable inference
A logical conclusion drawn from evidence admitted at trial. It differs from speculation, which lacks an evidentiary foundation.
Province of the jury
The jury’s exclusive responsibility to evaluate evidence, decide disputed facts, and determine whether guilt was proved beyond a reasonable doubt.
Abuse of discretion
A ruling that exceeds the reasonable bounds of a trial court’s decision-making authority or applies the wrong legal principle.
Harmless error
An error that does not justify reversal. For the constitutional error here, the State had to prove beyond a reasonable doubt that it did not contribute to the verdict.
Presumptively prejudicial delay
A delay long enough to trigger a full speedy-trial analysis. It does not automatically establish a violation.
Sufficiency of the evidence
The minimum evidence necessary for a rational jury to convict. It is distinct from whether an appellate court personally finds the evidence persuasive.
Trial error versus evidentiary insufficiency
Trial error generally permits a new trial. Insufficient evidence requires acquittal and bars retrial.

Potential Impact

  • Protection of defense closing arguments: Nevada courts must permit counsel to draw evidence-based inferences that an alternative suspect committed the offense.
  • Careful jury instructions: Judges may tell jurors that a third party is not on trial, but may not imply that the third party’s possible involvement is irrelevant to reasonable doubt.
  • Limits on sanctions: Sanctions or contempt threats may become constitutional error when they chill the presentation of a lawful defense.
  • No license for unsupported accusation: The decision does not authorize accusations based solely on conjecture. The proposed inference must arise from admitted evidence.
  • Retrial remains available: When the evidence is sufficient but the defense was improperly restricted, the remedy is ordinarily a new trial rather than dismissal.

Conclusion

CARVALHO (KATRINA) v. STATE (CRIMINAL) establishes that a court may not transform the rule against adjudicating a third party’s guilt into a prohibition against considering an alternative suspect as a source of reasonable doubt. Because the evidence permitted an inference that Regina may have been the shooter, Carvalho was entitled to present that inference fully to the jury.

The district court’s repeated interruptions, jury admonitions, monetary sanction, and contempt threat effectively removed Carvalho’s principal defense and violated her due process right to present a complete defense. The conviction was therefore reversed, while the rejection of Carvalho’s speedy-trial and sufficiency claims allowed the State to retry her before a different judicial department.