Law & Order: Special Victims Unit: Season 10, Episode 4

Lunacy

Detectives Elliot Stabler and Olivia Benson investigate when a famous astronaut, Marga Janssen is found dead, and Detective Stabler's old mentor, Dick Finley (special guest star James Brolin), helps investigate the case. They first believe the rape is linked to a string of serial rapes, but they are soon led to look for a suspect in the group of people Marga worked with. An obsessed fan is questioned, but is released and gets into a gun battle with Dick. Stabler becomes suspicious of Dick after he keeps pointing them away from him, but it's revealed that Dick killed Marga because she was stealing his spotlight.