Dennis Dirk Blocker (born July 31, 1957) is an American actor. He earned his first regular TV role on Baa Baa Black Sheep (1976–1978), playing pilot Jerry Bragg. From 2013–2021, he starred as Detective Michael Hitchcock on the Fox/NBC comedy series Brooklyn Nine-Nine. Born in Los Angeles, California, he is the son of actor Dan Blocker and Dolphia Lee Blocker (née Parker). His brother is producer David Blocker.

Filmography