Jim Hettes is injured and has been forced to pull out of a UFC 159 bout against Steven Siler, replacing him with be Kurt Holobaugh. Holobaugh comes to the UFC after a short run in Strikeforce, where he was defeated by Pat Healy via decision. Siler has won three of four in UFC competition, but is coming off of a loss to Darren Elkins by decision at UFC 154. UFC 159 takes place on April 27th from the Prudential Center in Newark, New Jersey with Jon Jones and Chael Sonnen headlining.