Fiedler, who also was best known for playing Mr. Peterson, the henpecked therapy patient on "The Bob Newhart Show," died Saturday at the Lillian Booth Actor's Fund Home, where he had been a patient since November, the Los Angeles Times reported.
His career lasting more than 50 years spanned the stage, screen and television, playing meek, mild-mannered characters.
He played Juror No. 2, the unassuming bank clerk, in director Sidney Lumet's classic 1957 film of the Reginald Rose courtroom drama "12 Angry Men," starring Henry Fonda.
The son of an Irish-German beer salesman, Fiedler was born in Platteville, Wis. After graduating from high school, he enlisted in the Navy. He later moved to New York, where he studied acting at the Neighborhood Playhouse.
In addition to a brother, Fiedler is survived by his sister, Mary Dean, of Milwaukee.