He played Mark Sanger, the aide and bodyguard to Raymond Burr's wheelchair-using title character, in the NBC drama that ran from 1967 to 1975.
A native of Houston who attended UCLA, Mitchell starred opposite Pam Grier in the sequel Scream Blacula Scream in 1973, playing an ex-police officer with an interest in the occult.
He also appeared on such TV shows as I DREAM OF JEANNIE, THE FUGITIVE, WONDER WOMAN, MCMILLAN & WIFE and MATLOCK..
In daytime, Mitchell played Ed Lawrence on the CBS soap opera CAPITOL in 1985-86.
Mitchell was married to actress Judy Pace, who played Vickie in PEYTON PLACE, from 1972-86. Their daughter, Julia Pace Mitchell, starred as Sofia Dupre Winters in THE YOUNG AND THE RESTLESS from 2010-12.