Landesberg died Friday morning of cancer. "I'm sorry to report the loss of Steve," Landesberg's agent said in a statement.
Landesberg was best known for his role in Barney Miller, where he played Detective Arthur P. Dietrich. He went on to appear in such films as Forgetting Sarah Marshall, Wild Hogs and Leader of the Band.
Among his television work: The Rockford Files, Law & Order, Saturday Night Live, and The Golden Girls. He most recently starred in Head Case, a Starz original series that featured celebrities going through faux-therapy sessions.
Reps for the actor did not immediately respond to TVGuide.com's request for comment.