Former Hill Street Blues Stars Daniel J. Travanti will appear on an episode of Criminal Minds next season. 

The Emmy winner will take on the role of a serial killer named Mr. Mullens, TV Guide reports, one whose brutal murders two decades ago earned him the nickname "The Butcher." In what way will he resurface?

Look for the 75-year-old character to be suffering from Alzheimer's. He'll crosses paths with the Behavioral Analysis Unit when he comes out of retirement and attempts to kill again, even though he can't remember his violent past.

The role marks Travanti's first television appearance since a 2008 episode of Grey's Anatomy.

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