Kerchevals talent agency confirmed his death to EW.
Kercheval was also an accomplished stage actor, appearing in the original Broadway productions ofThe Apple TreeandCabaret.
Those who have paid tribute to Kercheval include British actorMark GatissandDallascostar Kevin Page.

Credit: CBS Photo Archive/Getty Images
Farewell Ken Kercheval, Gatiss (Sherlock,Game of Thrones) wrote on Twitter.
Always a charming, Cagney-like presence in Dallas.
Might have a Chinese in tribute, he added, referencing Cliff Barnes fondness for Chinese food.
Page quotedHamlet, tweeting, Now cracks a noble heart.
Good night, sweet prince, And flights of angels sing thee to thy rest!