Actor Peter Graves Found Dead

Graves, who stared in “Mission: Impossible," “Airplane!" and Billy Wilder's “Stalag 17"--apparently died of natural causes, the sources said.

Graves was 83, according to a biography on the website IMDB.com, was the younger brother of Gunsmoke's star James Arness.

In a Times story late last year, Graves said he initially turned down the role for “Airplane!" because he thought it was in poor taste--until actors Robert Stack, Lloyd Bridges and Leslie Nielsen signed on to the cast. “They say you are supposed to stretch as an actor, so let's go stretch it," he told The Times' Susan King.