Daniel J. Travanti

Hill Street Blues star Daniel J. Travanti is headed to the other side of the law: The Emmy and Golden Globe-winning actor will guest-star as a serial killer in upcoming episode of Criminal Minds, TVGuide.com has learned exclusively.

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Travanti will play Mr. Mullens, a crotchety 75-year-old whose brutal murders 20 years ago earned him the nickname "The Butcher." Now suffering from Alzheimer's and depending on the live-in care of his adult son, Mullens crosses paths with Hotch (Thomas Gibson) and the rest of the Behavioral Analysis Unit when he comes out of retirement in a desperate attempt to reprise his violent past — a past he can no longer remember.

Travanti, 70, is best known for playing the intense, somber Capt. Frank Furillo on Hill Street Blues, a role for which he earned two Emmys and Golden Globe. He also starred on ABC's short-lived Missing Persons in the early '90s and more recently guest-starred as President Richard Mills on Fox's Prison Break.

Check out photos of the Criminal Minds cast

Criminal Minds
returns Wednesday, Sept. 22 at 9/8c on CBS. Travanti will appear in the season's fourth episode, "Remembrance of Things Past," which is slated to air in October.

Do you think Travanti will make a good adversary?