Accident Theory Forecloses Self-Defense and Imperfect Self-Defense (Voluntary Manslaughter) Instructions in New Mexico

Case: State v. Lopez (No. S-1-SC-40306)
Court: Supreme Court of New Mexico
Date: May 11, 2026
Disposition: Conviction affirmed by nonprecedential decision under Rule 12-405(B) NMRA

Citation note: The Court expressly states this decision was not selected for publication and is subject to Rule 12-405 NMRA restrictions on citation. The commentary below focuses on its doctrinal significance and its use of established precedent, rather than treating it as binding new law.

I. Introduction

State v. Lopez arises from a Thanksgiving Day shooting at the La Tiendita gas station in Alcalde, New Mexico, where Timothy Marc Lopez (Defendant-Appellant) shot Derek Velarde (Victim). The State (Plaintiff-Appellee) prosecuted Defendant for first-degree murder (willful and deliberate) under NMSA 1978, Section 30-2-1(A)(1) (1994).

The factual backdrop included Defendant’s earlier accusations that Victim had raped Defendant’s girlfriend, Lynsey Horcacitas, and audio evidence of Defendant making prior statements about wanting or planning to kill Victim. At the gas station, surveillance showed Defendant approach Victim’s truck, strike the driver’s-side window, and then fire a shot through the window, killing Victim.

On appeal (a “capital appeal” under Rule 12-102(A)(1) NMRA), Defendant raised four principal issues:

  • Whether the trial court erred (or fundamentally erred) by not instructing on voluntary manslaughter when it instructed on self-defense;
  • Whether counsel was ineffective for withdrawing and not re-requesting a voluntary manslaughter instruction;
  • Whether the district court abused its discretion in allowing a rebuttal witness (Jimmy Campbell) to testify;
  • Whether sufficient evidence supported first-degree deliberate-intent murder and the rejection of self-defense.

II. Summary of the Opinion

The Supreme Court of New Mexico affirmed. The Court held that the absence of a voluntary manslaughter instruction was not error because Defendant’s consistent “theory of the case” was accident—i.e., the shooting was unintentional—making instructions premised on intentional killing (self-defense and voluntary manslaughter, including imperfect self-defense) unwarranted under State v. Lucero, 2010-NMSC-011. The Court rejected the related ineffective-assistance claim because it depended on the same incorrect premise (that Defendant was entitled to the manslaughter instruction). The Court also found no abuse of discretion in allowing Campbell’s rebuttal testimony under the State v. Mora, 1997-NMSC-060 factors, and held substantial evidence supported deliberate intent and negated self-defense.

III. Analysis

A. Precedents Cited and Their Role

Case / Authority (as cited in the Opinion) Rule or Principle Used in State v. Lopez How it Influenced the Outcome
State v. Taylor, 2024-NMSC-011, ¶ 10, 548 P.3d 82 Jury-instruction propriety is a mixed question reviewed de novo. Set the standard of review for the instruction dispute.
State v. Henley, 2010-NMSC-039, ¶ 25, 148 N.M. 359, 237 P.3d 103, overruled on other grounds by State v. Ward, ___-NMSC-___, ¶ 45, ___P.3d___ (S-1- SC-40503, Mar. 16, 2026) If evidence supports a theory-of-the-case instruction, failure to instruct is reversible error; also: “Self-defense, unlike accident, is an intentional act.” The Court used Henley’s intentionality distinction (paired with Lucero) to conclude Defendant’s accident theory did not warrant self-defense/voluntary manslaughter instructions.
State v. Zamarripa, 2009-NMSC-001, 145 N.M. 402, 199 P.3d 846 No waiver when counsel “makes the best of a bad situation” after an objection is rejected. Defendant invoked Zamarripa to argue preservation despite withdrawal; the Court found no error regardless, so it did not need to resolve preservation/waiver.
State v. Barber, 2004-NMSC-019, ¶ 19, 135 N.M. 621, 92 P.3d 633 Fundamental error: higher scrutiny after assessing whether error occurred; focuses on juror confusion/misdirection and miscarriage of justice. Framed the “reversible vs fundamental error” discussion; ultimately irrelevant because the Court found no instructional error at all.
State v. Abeyta: 1995-NMSC- 051, ¶ 47, 120 N.M. 233, 901 P.2d 164, abrogated on other grounds by State v. Campos, 1996-NMSC-043, ¶ 32 n.4, 122 N.M. 148, 921 P.2d 1266 If evidence supports self-defense, defendant is entitled to voluntary manslaughter based on imperfect self-defense. The Court distinguished/limited Abeyta’s pathway by holding the self-defense instruction itself was unwarranted under an accident theory; thus Abeyta did not trigger a manslaughter instruction.
State v. Reynolds, 1982-NMSC-091, ¶¶ 11-12, 98 N.M. 527, 650 P.2d 811 Deliberate-intent verdict does not necessarily foreclose that a jury could have found provocation if properly instructed. Defendant used Reynolds to argue prejudice; the Court bypassed this because it found no entitlement to manslaughter instruction given the accident theory.
State v. Lucero, 2010-NMSC-011, 147 N.M. 747, 228 P.3d 1167 Self-defense is an intentional killing justified by fear of imminent harm; accident is an unintentional, non-negligent killing (excusable) lacking a mens rea for homicide offenses; defendant must produce evidence of intentional firing to obtain self-defense instruction. Central doctrinal engine of the opinion: because Defendant claimed the gun fired when Victim “yanked” his arm, the Court treated his defense as accident, making intentional-killing instructions (self-defense; voluntary manslaughter/imperfect self-defense) not legally supported.
State v. Benally, 2001-NMSC-033, ¶ 12, 131 N.M. 258, 34 P.3d 1134 Juror confusion/misdirection can arise from omission or misstatement failing to provide accurate law. Supported the conclusion that omission of manslaughter instruction did not misstate the law applicable to Defendant’s accident theory.
State v. Smith, 2016-NMSC-007, ¶ 62, 367 P.3d 420 Ineffective assistance requires unreasonable performance and prejudice; prima facie test on appeal. Framework used to reject IAC claim because there was no underlying entitlement/error and thus no showing of prejudice.
State v. Crocco, 2014-NMSC-016, ¶ 13, 327 P.3d 1068 IAC claims often better suited to habeas due to record development limits. The Court acknowledged the general rule but held further factual development would not cure the legal defect in Defendant’s IAC theory.
State v. Desnoyers, 2002-NMSC-031, ¶ 25, 132 N.M. 756, 55 P.3d 968, abrogated on other grounds by State v. Forbes, 2005-NMSC-027, ¶ 6, 138 N.M. 264, 119 P.3d 144 Discovery rulings/remedies reviewed for abuse of discretion; materiality uses a “reasonable probability” standard; Desnoyers quotes State v. Chavez, 1993- NMCA-102, ¶ 20, 116 N.M. 807, 867 P.2d 1189. Informed the disclosure/materiality analysis for rebuttal witness testimony.
State v. Wilson, 2001-NMCA-032, ¶ 39, 130 N.M. 319, 24 P.3d 351, abrogated on other grounds as recognized by State v. Montoya, 2005-NMCA- 078, 137 N.M. 713, 114 P.3d 393 Discovery violation remedies are discretionary. Supported deferential review of the trial court’s remedial choices (interview + surrebuttal).
State v. Simonson, 1983-NMSC-075, ¶ 32, 100 N.M. 297, 669 P.2d 1092 Admissibility of rebuttal evidence is within trial court discretion. Reinforced discretion to allow Campbell’s rebuttal.
State v. Brown, 1998-NMSC-037, ¶ 32, 126 N.M. 338, 969 P.2d 313 Abuse of discretion: decision against logic and not justified by reason. Applied to uphold admission of rebuttal witness.
State v. Mora, 1997-NMSC-060, ¶ 43, 124 N.M. 346, 950 P.2d 789, abrogated on other grounds by State v. Frazier, 2007-NMSC-032, ¶ 31, 142 N.M. 120, 164 P.3d 1 Four-factor test for late disclosure during trial: duty/bad faith; materiality; prejudice; cure. Operative test used to reject Defendant’s rebuttal-witness challenge.
State v. Sutphin, 1988-NMSC-031, ¶ 21, 107 N.M. 126, 753 P.2d 1314; State v. Garcia, 1992-NMSC-048, ¶ 27, 114 N.M. 269, 837 P.2d 862; State v. Duran, 2006-NMSC-035, ¶ 5, 140 N.M. 94, 140 P.3d 515; State v. Garcia, 2016-NMSC-034, ¶ 15, 384 P.3d 1076 Substantial-evidence review; view evidence in light most favorable to verdict; jury may reject defendant’s version; appellate courts do not reweigh credibility. Supported affirmance on sufficiency for deliberate intent and rejection of self-defense.
State v. Chavez, 1983-NMSC-037, ¶ 6, 99 N.M. 609, 661 P.2d 887 and UJI 14-5191 NMRA First-aggressor limitation: one who provokes encounter may lose self-defense; UJI recognizes “aggressor” limitation and keeps fact questions for jury. Appears in a footnote explaining the district court’s initial self-defense denial rationale; the Supreme Court notes Chavez’s general statement does not remove first-aggressor determinations from the jury where evidence raises issues.
UJI 14-5171 NMRA; UJI 14-5140 NMRA; UJI 14-220 NMRA Self-defense requires killing “because of” fear; excusable homicide (accident) requires “without any unlawful intent”; voluntary manslaughter includes knowledge of strong probability of death or great bodily harm. Anchored the Court’s mental-state distinction: accident is inconsistent with the intent predicates embedded in self-defense and voluntary manslaughter instructions.
Rule 5-501(A)(5) NMRA Prosecutor must provide witness list of witnesses intended to be called at trial. Used to evaluate the claimed discovery violation regarding Campbell; Defendant’s concession that Campbell was initially listed undercut the breach argument.

B. Legal Reasoning

1. The core holding: an “accident” theory does not support self-defense or voluntary manslaughter instructions

The Court’s decisive move was to treat Defendant’s presentation as an “accident” case, not an “intentional but justified/mitigated homicide” case. Defendant repeatedly asserted the gun fired when Victim “yanked” his arm, and that he “did technically” fire only in a mechanical sense because the gun discharged during a struggle.

Under State v. Lucero, 2010-NMSC-011, the Court emphasized that:

  • Self-defense is an intentional killing done “because of” fear of imminent death or great bodily harm (justification).
  • Accident (excusable homicide) is unintentional and non-negligent, and therefore lacks the culpable mental state “cognizable” to homicide offenses (excuse).

The Court then drew a straightforward doctrinal consequence: because Defendant offered no evidence that he intentionally and purposefully fired (as Lucero requires to warrant a self-defense instruction), he was not entitled to instructions whose logic depends on intentionality—self-defense and voluntary manslaughter (including “imperfect self-defense” manslaughter).

2. Why the Court refused to let the granted self-defense instruction “bootstrap” a manslaughter instruction

Defendant’s appellate argument attempted a syllogism: if self-defense was instructed, then (under State v. Abeyta) the court “was also required” to instruct on voluntary manslaughter based on imperfect self-defense. The Court rejected that approach because it treats the existence of an instruction as proof of legal entitlement.

Instead, the Court looked behind the instruction to the evidentiary predicate and legal compatibility: an erroneously granted instruction does not create an obligation to give another instruction. Because the self-defense instruction “was unwarranted” under the accident theory, Abeyta’s imperfect-self-defense pathway never activated.

3. Preservation and standards of review became irrelevant once the Court found “no error”

Defendant invested heavily in whether the voluntary-manslaughter issue was preserved (invoking State v. Zamarripa) and whether to review for reversible or fundamental error (under State v. Barber). The Court declined to decide preservation because both standards share a threshold question: was there error? Finding no instructional error, the Court ended the inquiry.

4. Ineffective assistance: no deficient performance or prejudice where no instruction was legally warranted

Under State v. Smith, 2016-NMSC-007, Defendant needed to show unreasonable performance and prejudice. The Court held the IAC claim collapsed because it depended on a legal premise the Court rejected—entitlement to a voluntary manslaughter instruction given the accident theory. The Court also cited State v. Crocco, 2014-NMSC-016 to note that habeas is often the proper vehicle for IAC, but held further factual development could not fix the legal flaw as argued.

5. Rebuttal witness: application of Mora’s late-disclosure factors

The Court evaluated Campbell’s rebuttal testimony through the four State v. Mora, 1997-NMSC-060 factors:

  • Duty/bad faith: Defendant conceded Campbell was initially on the witness list, undermining any breach under Rule 5-501(A)(5) NMRA; allegations of “skirting” rules were unsupported.
  • Materiality: Defendant did not show a “reasonable probability” of a different result had disclosure occurred earlier (via State v. Desnoyers).
  • Prejudice: Defendant asserted strategy impact but did not concretely explain how earlier notice would have changed choices in a way affecting outcome.
  • Cure: The trial court permitted a pre-testimony interview and allowed surrebuttal by Defendant, which the Court treated as adequate on the record presented.

With discretion principles from State v. Brown and rebuttal admissibility from State v. Simonson, the Court found no abuse.

6. Sufficiency of the evidence: deliberate intent and rejection of self-defense

Applying the deferential substantial-evidence framework (State v. Sutphin; State v. Garcia, 1992-NMSC-048; State v. Duran), the Court cataloged evidence supporting:

  • No self-defense: Defendant approached Victim with gun drawn, struck the window, shot through a mostly-up window, lacked injuries, and (per Campbell) announced an intent to kill.
  • Deliberate intent: Months of statements about killing Victim and planning (including a “bunker”), motive related to the alleged rape, and an on-scene declaration (“I’m going to kill you. You raped my wife.”).

The Court rejected Defendant’s analogy to State v. Garcia, 1992-NMSC-048, where the record lacked evidence of careful thought; here, the Court viewed pre-killing statements and planning as direct evidence of deliberation, even if the final shooting happened quickly.

C. Impact

Although nonprecedential, the decision is noteworthy for its crisp reinforcement of a litigation-choice constraint that can matter in charging conferences and instruction disputes:

  • Defense theory alignment: A defendant who frames the homicide as an accidental discharge may undermine entitlement to self-defense and voluntary manslaughter (imperfect self-defense) instructions, because those doctrines presuppose an intentional use of deadly force.
  • Instruction “bootstrapping” discouraged: The Court’s reasoning implies that the mere presence of a self-defense instruction (even if given) does not automatically entitle a defendant to additional mitigation instructions; courts will scrutinize the evidentiary basis and internal coherence of the defendant’s theory.
  • Rebuttal witness management: The application of Mora underscores that when a previously listed witness becomes practically available only after the defense case unfolds, trial courts retain wide latitude to cure timing issues with interviews and surrebuttal rather than exclusion.

Practically, the opinion signals that defendants and counsel must make early, deliberate choices about whether the theory is “I intentionally shot because I had to” (self-defense), “I intentionally shot but under unreasonable fear/mitigation” (imperfect self-defense voluntary manslaughter), or “I did not intentionally shoot” (accident/excusable homicide). Attempting to blend these theories can narrow available instructions.

IV. Complex Concepts Simplified

  • Willful and deliberate first-degree murder: Requires proof that the defendant formed a deliberate intent to kill—i.e., considered and decided to kill, not a purely impulsive act.
  • Self-defense (justification): Admits an intentional killing but claims it was lawful because it was done out of fear of imminent death or great bodily harm.
  • Accident / excusable homicide (excuse): Claims the killing was unintentional and occurred while acting lawfully and carefully; if believed, it negates the mental state required for homicide.
  • Voluntary manslaughter / imperfect self-defense: A partial mitigation for an intentional killing committed under provocation or an unreasonable (imperfect) belief in the need for self-defense—reducing murder to manslaughter.
  • Fundamental error vs reversible error: Both require identifying an error first; fundamental error additionally requires a showing of a miscarriage of justice.
  • Rebuttal witness: A witness called after the defense case to contradict or respond to new defense evidence; admissibility is typically within the trial court’s discretion.
  • Nolle prosequi: The State’s formal dismissal of a charge; it does not necessarily mean a person involved cannot later testify as a witness.
  • Substantial evidence review: On appeal, the court asks whether any rational jury could find guilt beyond a reasonable doubt, viewing evidence favorably to the verdict and not reweighing credibility.

V. Conclusion

State v. Lopez affirms a first-degree murder conviction while delivering a clear doctrinal message rooted in State v. Lucero, 2010-NMSC-011: an “accident” theory—an unintentional discharge—does not support jury instructions that justify or mitigate intentional homicide, including self-defense and voluntary manslaughter based on imperfect self-defense. The Court also reinforces the breadth of trial-court discretion in handling late-emerging rebuttal testimony under State v. Mora, 1997-NMSC-060, and it applies orthodox substantial-evidence principles to uphold findings of deliberate intent and the rejection of self-defense.

Even as an unpublished decision, the opinion functions as a cautionary roadmap for how theory-of-the-case choices govern the availability of homicide defenses and lesser-included-offense instructions in New Mexico practice.