This is one of the rare episodes where the detectives didnt meet the killer or know who he was until 40 minutes into the show. While robbing a bank, a robber shoots a security guard and then flees via taxicab. A girlfriend of his happened to be working there that day as a substitute. The robber had a ski-hat on. Kate later catches him with another woman, but he convinces her to keep everything a secret. The detectives follow leads given to them by a newspaper guy outside the bank, and the cab driver. They eventually track Dean down and discover he is the killer by noticing that his bracelet was the same one he wore during the robbery (caught on camera). Dean takes Kate to a cliff with the possible intention of killing her. The detectives find them there and Dean surrenders.