Can a defendant be convicted by the testimony of an accomplice?

A defendant cannot be convicted by the testimony of an accomplice unless it is corroborated by other evidence. (Pen. Code, 1111.) If there is evidence that a witness is an accomplice, the trial court must give jury instructions defining "accomplice," that such testimony is to be viewed with caution, and that it must be corroborated. If the evidence establishes that the witness is an accomplice as a matter of law, the court must instruct the jury accordingly. (People v. Felton (2004) 122 Cal.App.4th 260, 267-268.)