Plot summary
Office worker Phoebe Morton ( Melissa Hickey ) dies by bondage strangulation while her killer calls 9-1-1 and has a shibboleth, a particular articulation of "T" words. Goren and Eames realize that Morton is one of five women murdered by a serial killer known as Body By Jake (B.B.J.) between 1989 and 1992, but who has been inactive since then. Their investigation of abuse victims leads them to parolee Keith Durbin ( Paul Sparks ) who displays the same shibboleth as in the 9-1-1 call. He is arrested and is questioned before a Grand Jury and appears guilty but Goren is not convinced he is a killer.
They question railway worker Frank McNare ( Kevin Conway ) at the subway station which connects the murder victims and discover he is father of Durbin. He has the same shibboleth as his son, who as a boy saw a photo of woman bound and semi-naked in his father's car, and they charge McNare with the murders.
Credits
Adapted from Wikipedia contributors, Law & Order: Criminal Intent season 4. HTML formatting and reference markers removed.