Annihilated

S8 E20: A young woman engaged to be married is raped and murdered, and her fiancé Stephen Dashiell (guest-star Dylan Walsh) may have been targeted -- When Dets. Stabler (Chris Meloni) and Benson (Mariska Hargitay) speak to the girls grief-stricken parents they discover her fiancé, a CIA agent named Stephen Dashiell (guest star Dylan Walsh), had been threatened by terrorists -- they believe this may have been a professional hit. Their difficult search for Dashiell leads them to a perfect suburban family - and then a tragedy - one that pushes Stabler to face new truths about his own family. Dann Florek, Richard Belzer, Diane Neal, B.D. Wong, and Tamara Tunie also star.