Butler has appeared in dozens of supporting roles in movies and television. He was in The Silence of the Lambs, Columbo, Quantum Leap, The X Files, Caroline in the City, Star Trek: Voyageur, King of the Hill, Suddenly Susan, Ally McBeal, Malcolm in the Middle, Monk and Law and Order: Criminal Intent.
Butler is a vocal advocate for gay rights and was one of many public to speak out against California's Proposition 22 that would have defined marriage as being between a man and a woman. He came out on an episode of Entertainment Tonight in 1994 while playing the aggressively heterosexual sportscaster "Bulldog" on Frasier.
- Appeared with Stacy Edwards in Chronic Town
- Appeared with Odette Annable on Quintuplets
- Appeared with Jodi Long on Miss Match
- Appeared with Arlen Escarpeta and Matthew John Armstrong on American Dreams
- Appeared with Steve Valentine and Zeljko Ivanek on Crossing Jordan
- Appeared with James LeGros in Enemy of the State
- Appeared with Andrea Bendewald and Nestor Carbonell on Suddenly Susan