(written from a Production point of view)
Sheppard was the regular stunt double for western star Audie Murphy and doubled him in the action film Seven Ways From Sundown (1960, with Bob Herron), the western Posse from Hell (1961), Six Black Horses (1962, with Bill Catching and Robert Herron), Showdown (1963), Bullet for a Badman (1964, with Bob Herron), Apache Rifles (1964), Arizona Raiders (1965), Gunpoint (1966), and 40 Guns to Apache Pass (1967, with Jesse Wayne).
Further stunt work includes the western Major Dundee (1965, with Bill Catching, Robert Herron, and Hal Needham), the drama The War Lord (1965, with Hal Needham, Robert Herron, Tony Epper, and Ronnie Rondell, Jr.), the crime drama Harper (1966, with Paul Baxley, Dick Crockett, Robert Herron, Jerry Summers, and Ron Veto), the western Stagecoach (1966, with Bennie E. Dobbins and Jim Burk), the western Hour of the Gun (1967, with David Perna and Gary Combs), the science fiction film Planet of the Apes (1968), the western A Time for Dying (1969), the western The Wild Bunch (1969), the drama The Wind and the Lion (1975), and the western The Master Gunfighter (1975).
His television work includes episodes of The Big Valley (1966, with Celia Lovsky, Louise Sorel, and Warren Munson), Hondo (1967, with Roy N. Sickner and Ed McCready), and Gunsmoke (1970, with Ricardo Montalban).
Sheppard died on 18 August 1977 during the filming of the western Comes a Horseman. He was dragged to death behind a horse while filming in Westcliffe, Colorado.