Character actor Sydney Lassick, best known for his role as Cheswick in the film “One Flew Over the Cuckoo’s Nest,” died April 12 at Midway Hospital in L.A. He was 80 and had suffered over the last several years from diabetes and related health problems.

Chicago native and WWII Navy vet studied drama at DePaul U. before pursuing his extensive showbiz career.

Just of few of his more than 100 film credits also include “The Unseen,” “Carrie,” “Deep Cover,” “Man on the Moon” and “History of World Part 1.” In his last movie, “House of Pain,” which he completed only about four months before his death, he co-stars as an evil mayor.

TV credits are twice as extensive as his film ones; of his more than 200 TV appearances are “Something to Sing About” and gigs on “X-Files,” “Dream On,” “Moonlighting,” “Night Court” and many more.

Funeral services will be held 1 p.m. Sunday April 20 at Mount Sinai Memorial Parks and Mortuaries, 5954 Forest Lawn Drive, L.A.