The Hollywood Reporter states that Kercheval died on Sunday night, confirming the news with a funeral home in Indiana.
He is believed to have died of pneumonia.
Kercheval was best known for playing Cliff Barnes and was one of only two cast members to remain on the show through its 14 seasons as well as returning for the primetime show’s reboot.
Barnes had a longstanding rivalry with JR Ewing and a close relationship with his sister Pamela (Victoria Principal) and was not happy when she married Bobby Ewing (Patrick Duffy).
Kercheval made his Broadway debut in the 1962 Something About a Soldier.
He also played the title character in the original Broadway production of Fiddler on the Roof.
Kercheval was a lung cancer survivor and had five children from three marriages, all of which ended up in divorce.