In 1957 and 1958, he played in two youth films, as Bob Williams in "The Careless Years" and Joe Wilson in "The Hot Angel". Other Dinehart appearances were on "Sky King" as Jimmy Ness in "Frogmen" and as Tex Fallon in "The Unwanted" on "26 Men". He played the character Greg in "Half a Loaf" on the syndicated western anthology series "Death Valley Days", hosted in 1959 by Stanley Andrews. This role united Dinehart with western actor Bob Steele in the role of Dawson; Steele had appeared as Deputy Sam in four episodes of "The Life and Legend of Wyatt Earp". Richard Crane was cast as Monte. Dinehart was cast in two episodes, "The Homesteaders" and "The Twisted Road," of the syndicated western series "Frontier Doctor", starring Rex Allen. He played Don Carter in the 1959 episode "Millionaire Sally Simms" opposite Venetia Stevenson on the CBS fantasy drama "The Millionaire". In 1959, he was cast as Danny Holden in the episode "Love on the Rocks", with Virginia Christine as Rena Desmond, on the syndicated crime drama "State Trooper", with Rod Cameron as the fictitious officer Rod Blake of the Nevada State Police. Dinehart also played a comedy role as "Bill Masterson" in the 1957 episode "The General" of the CBS series "The George Burns and Gracie Allen Show", with George Burns and Gracie Allen. Dinehart's last roles were in 1959 and 1960, including three appearances on the CBS series "The Texan", starring Rory Calhoun. Twice he played "The Brazos Kid". Dinehart played Todd Kenyon in the episode "The Swindle" of the 11-episode NBC crime drama "21 Beacon Street", a summer-replacement series starring Dennis Morgan, Joanna Barnes, and Brian Kelly. Dinehart's last screen appearance was as Bob Treadwell in the 1960 film "Platinum High School." Dinehart's business career began around 1960 with Bank of America. He is now a consultant in litigation and arbitration for FEND, a company based in Los Angeles.