Recognizing that “[w]hen two or more persons commit a crime together, both may act in part as the actual perpetrator and in part as the aider and abettor of the other, who also acts in part as an actual perpetrator”
Concluding that the record and the jury's "careful consideration of its penalty verdict" demonstrated that the defendant received an individualized determination of culpability
In People v. Antick (1975) 15 Cal.3d 79 [ 123 Cal.Rptr. 475, 539 P.2d 43], we held that one robber cannot be vicariously liable for the death of an accomplice due to the deceased robber's actions because people cannot murder themselves.