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.

Ken Kercheval In ‘Dallas’ A promotional still from the American television series ‘Dallas’ shows American actor Ken Kercheval as character Cliff Barnes, 1980. (Photo by CBS Photo Archive/Getty Images)

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!