Brad Dexter, 85, an actor who rode with Yul Brynner in The Magnificent Seven and became a confidant of Marilyn Monroe and Frank Sinatra, died Thursday in Rancho Mirage, Calif. He had been hospitalized with emphysema.

Burly and handsome, he was often cast as a tough guy in supporting roles, which included 1958's Run Silent, Run Deep, starring Burt Lancaster and Clark Gable, and 1965's None but the Brave, starring Mr. Sinatra. He made his film debut in the The Asphalt Jungle in 1950, but his most prominent role came in 1960's The Magnificent Seven, in which he starred with Mr. Brynner, Steve McQueen, Charles Bronson and James Coburn.

His biggest movie credit as a producer was Lady Sings the Blues, the Billie Holiday story starring Diana Ross in 1972.