Is there any case law supporting a defendant's conviction as an aider and abettor of a murder?

support a defendant's murder conviction as an aider and abettor." (Medina, supra, 46 Cal.4th at p. 921.) "[A]lthough evidence indicating whether the defendant did or did not know a weapon was present provides grist for argument to the jury on the issue of foreseeability of a homicide, it is not a necessary prerequisite." (People v. Godinez (1992) 2 Cal.App.4th 492, 501, fn. 5.) In the context of a gang altercation, a jury could rationally conclude that a conflict between non gang members who disrespected a gang's territorial boundaries and interfered with an attempted robbery could escalate into a fatal confrontation.