The funnyman died on Monday (20Dec10), according to his agent Jeffrey Leavitt. He had reportedly been battling cancer.
Landesberg started his career as a stand-up comedian in New York before landing his most famous role as Detective Arthur Dietrich in hit TV sit-com Barney Miller in 1975, with the show running until 1982.
He went on to appear in other TV series such as The Cosby Show, Golden Girls and Ghost Whisperer, as well as parts in movies including Forgetting Sarah Marshall and Wild Hogs.
He is survived by his wife, Nancy Ross Landesberg, and a daughter, Elizabeth.