S7·E10 Dropped Call / Derailed

A young man lay shot dead in the middle of a street. Can a cell phone and a pawnshop ticket hold the clues detectives will need? The body of a woman is found dumped on some railroad tracks. Detectives are shocked when a tip comes in that someone may be holding out on them. They are convinced when they learn this person knows things they shouldn't know unless they are the killer.