Cowboys linebacker DeMarvion Overshown will require season-ending surgery on his right knee, owner Jerry Jones said Tuesday morning on 105.3 The Fan in Dallas.Jones said the team was awaiting MRI results to determine the extent of Overshown’s injury. Without that information, Jones couldn’t reveal a timeline for the linebacker’s recovery.Overshown sustained the injury early in the fourth quarter of Monday’s 27-20 loss to the Cincinnati Bengals and did not return to the game.At the end of a 2-yard run by running back Chase Brown, Overshown’s right leg was rolled up on and pinned by tumbling Cincinnati center Ted Karras. Overshown was being blocked by Bengals guard Alex Cappa at the time.Overshown, 24, was having a breakout campaign after missing out on his rookie season when he tore the ACL in his left knee during a preseason game. He started all but one game this season and had been a bright spot in a rather disappointing season for the Cowboys (5-8).