A witness to a crime who, either as principal, Accomplice, or Accessory, was connected with the crime by unlawful act or omission on his or her part, transpiring either before, at time of, or after commission of the offense, and whether or not he or she was present and participated in the crime.
Generally, there can be no conviction solely on the basis of what is said by an accomplice witness; there must be evidence from an unrelated source to corroborate the witness's testimony.