Dallas star Ken Kercheval, who played J.R. Ewing's archrival, dies at 83

The Hollywood Reporter

Larry Hagman and Kercheval, who played oil tycoon Cliff Barnes on the classic primetime soap, were the only Dallas cast members who were on the show throughout its entire 1978-1991 run, from pilot to finale. He appeared on 342 episodes. He also reprised his role on TNT's 2012-14 Dallas reboot.