United States v. Rudy Garcia, 729 F.3d 1171

Garcia was tried for first-degree murder; convicted of involuntary manslaughter and acquitted of other counts; the conviction was reversed.
The district court used a Ninth Circuit model involuntary manslaughter instruction that omitted gross negligence as an element in one alternative and allowed conviction on unlawful act alone.
Evidence presented two versions: prosecution said Garcia retrieved a gun and intentionally shot McCraigie; defense said self-defense or accidental discharge during a struggle.
Defense sought to admit prior-acts evidence about McCraigie and MySpace photos; the district court excluded them.
During deliberations, the jury asked for more definition on counts; the court provided standard model instructions.
The court reversed based on the defective jury instruction; discussion of other evidentiary issues followed.

Issue	Plaintiff's Argument	Defendant's Argument	Held
Was gross negligence required for involuntary manslaughter?	Garcia	Garcia	Instruction lacked essential gross-negligence element
Was the instructional error harmless beyond a reasonable doubt?	Garcia's defense impact	Government	Error not harmless; reversal warranted

United States v. Keith, 605 F.2d 462 (9th Cir. 1979) (gross negligence required; knowledge of risk)
United States v. Shortman, 91 F.3d 80 (9th Cir. 1996) (gross negligence as element; cautions on instruction language)
United States v. Crowe, 563 F.3d 969 (9th Cir. 2009) (reiterates gross-negligence element in §1112)
United States v. McMillan, 820 F.2d 251 (8th Cir. 1987) (instruction concerns similar to gross-negligence issue)
United States v. Paul, 37 F.3d 496 (9th Cir. 1994) (model instruction inadequately distinguished mental states)
United States v. Main, 113 F.3d 1046 (9th Cir. 1997) (model instruction failed to adequately instruct proximate cause)
United States v. Hugs, 384 F.3d 762 (9th Cir. 2004) (instruction adequacy reviewed; error correction needed)