Without a Trace (2002)

S3E8 Doppelgänger: Part 2

After a homeless woman goes missing from a shelter, the team must revisit the case of twin brothers Greg and Rick Knowles. Five months prior, Greg had admitted to a string of vicious murders, but the team suspected that Rick was the true culprit behind the acts. With Greg now released from prison and cleared of the charges, the team races against time to uncover evidence that will prove Rick's guilt and protect one twin from the other.