Original:  After further interrogations, the police officers familiarized him with the psychological portrait they had compiled of the killer, which, after 12 hours, caused Atkins to admit to the murders of 11 women.
Revised:  After further interrogations, the police officers familiarized him with the psychological portrait they had compiled of the killer, which, after 12 hours, caused Tony admit to the murders of 11 women.
Edit intent: style