First Aired: May. 01, 2009 on CBS
Summary: Feeling guilty over the stabbing, Charlie puts his attention on finding a serial killer using math theories to help the team solve the case before another life is taken.
Main Characters in this Episode
Charlie Eppes: Some people drink, some gamble - I analyze data.
- Michelle Feynman, who played the irritated mother during the surveillance scene at the end, is the daughter of Richard Feynman, the mathematician on whom Charlie Eppes' character is loosely based.
- While on stakeout, Colby and Liz discuss "Sea of Love", and Colby asks if Liz is a "big Pacino fan". She replies that instead she is a big Michael Rooker fan.
- This is the 100th episode (excluding episode 0, which was unaired), as referenced ("100 episodes") in the opening shot (the black screen with data) with. It has several references to the first episode.