Can a person be found guilty of a crime as an aider and abettor even if someone else committed some or all of the criminal acts?

principals in any crime so committed.' (Pen. Code, 31; [citations].) Thus, a person who aids and abets a crime is guilty of that crime even if someone else committed some or all of the criminal acts. [Citation.] Because aiders and abettors may be criminally liable for acts not their own, cases have described their liability as 'vicarious.'" (People v. McCoy (2001) 25 Cal.4th 1111, 1116-1117.)

"To be guilty of a crime as an aider and abettor, a person must 'aid[] the [direct] perpetrator by acts or encourage[] him [or her] by words or gestures.' [Citations.] In addition, except under the natural-and-probable-consequences doctrine [citations], . . . the person must give such aid or encouragement 'with knowledge of the criminal purpose of the [direct] perpetrator and with an intent or purpose either of committing, or of encouraging or facilitating commission of,' the crime in question. [Citations.] When the crime at issue requires a specific intent, in order to be guilty as an aider and abettor the person 'must share the specific intent of the [direct] perpetrator,' that is to say, the person must 'know[] the full extent of the [direct] perpetrator's criminal purpose and [must] give[] aid or encouragement with the intent or purpose of facilitating the [direct] perpetrator's commission of the crime.' [Citation.] Thus, to be guilty of attempted murder as an aider and abettor, a person must give aid or encouragement with knowledge of the direct perpetrator's intent to kill and with the purpose of facilitating the direct perpetrator's accomplishment of the intended killingwhich means that the person guilty of attempted murder as an aider and abettor must intend to kill." (People v. Lee (2003) 31 Cal.4th 613, 623-624.)

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