Born in Blackpool, Lancashire, England, Mahoney moved to the United States in the 1950s and got his start as an actor when he joined John Malkovich and Gary Sinise in Chicago’s Steppenwolf Theatre in 1977. He would go on to win a Tony Award for his role in “The House of Blue Leaves.”
On the big screen, he appeared in such films as “Eight Men Out,” “Say Anything…,” “RECOiL” and “The Manhattan Project.”
Besides “Frasier,” he also appeared in TV shows like “Becker,” “Hot in Cleveland,” “ER” and “3rd Rock From the Sun.”
Mahoney never married or had any children.