Plot summary
Detectives Goren and Eames investigate the murder of Rosa Dern ( Adrianna Sevan ) a woman found slain in a hotel room in a manner similar to the "Motel Ripper", Kevin Riddick ( Jack Gwaltney ) a serial killer in prison on remand. The investigation leads them to a human behavior research institute run by psychiatrist Dr. Roger Buckman ( James Naughton ) studying limbic trigger syndrome where he theorizes that killers have a specific limbic lesion which can lead to rage killing with potentially diminished legal culpability. Their attention turns to his research assistant Dr. Cathleen Dwyer ( Jenny Bacon ), a shy woman. They discover that Riddick does not have the lesion, but Dwyer does, and she committed the murder under the influence of Riddick, subtly influenced by Buckman who is seeking to have his theory recognized.
Credits
Adapted from Wikipedia contributors, Law & Order: Criminal Intent season 1. HTML formatting and reference markers removed.