FILE - In this Sunday, Dec. 27, 2015, file photo, Dallas Cowboys defensive end Greg Hardy arrives prior to an NFL football game against the Buffalo Bills, in Orchard Park, N.Y. Former NFL defensive end Greg Hardy says he is “haunted” by his high-profile domestic violence past and wants to prove he has changed as he makes his debut in UFC, a promotion that hasn’t hesitated to embrace fighters with legal or drug problems. (AP Photo/Bill Wippert, File)