Castle - Season 4 Episode 4, Kick the Ballistics Recap

Original airdate 10/10/11 ... Episode 4x04

This episode of Castle was actually a lot less focused on it's namesake.  All the key players got some screen time, but this was more a story about Detective Kevin Ryan (Seamus Denver).

The victim is Jane Herzfeld, a young college student who tutored other students on the side. 

Her ex-boyfriend Finn McQueen is the first suspect because they had a somewhat volatile relationship in the past, according to her mother anyway.  But, McQueen's alibi checks out.

It was Ryan's old service weapon that was taken from him during the 3XK investigation last year that was used as the murder weapon.

This now points the finger at Jerry Tyson AKA 3XK.  Ryan takes this as a personal blow because he feels responsible for Tyson getting his gun.  He is frustrated and on a short fuse throughout much of the episode, almost getting into a fight with the second suspect Seth Carver and eventually getting lippy with Captain Gates, who tells him to take the rest of the day off.

Seth is actually an undercover cop himself and tells them Jane was tutoring a fellow student by the name of Ben Lee and was supposed to be an informant about Ben's father, Clifford.  Clifford is a huge drug kingpin and Castle likens him to "The Godfather."  Carver says that the Lees probably found out what she was doing and bumped her off.