The 76-year-old actor played Cliff Barnes, nemesis of J.R. Ewing (Larry Hagman), in the original series from 1978 to 1991.
He will appear in the updated Dallas for a multi-episode arc, according to TV Guide.
Ten episodes of the new show have currently been ordered, with Kercheval currently signed up to appear in the third, fourth and tenth instalments.
Other original Dallas actors confirmed to appear include Hagman, Patrick Duffy (Bobby Ewing), Linda Gray (Sue Ellen Ewing), Charlene Tilton and Steve Kanaly.
The Fast & The Furious actress Jordana Brewster and Desperate Housewives stars Brenda Strong, Jesse Metcalfe and Josh Henderson will also appear in the show.
Dallas will premiere on TNT in summer 2012.
Watch a trailer for the new Dallas below: