UFC 137 took a blow but quickly recovered earlier today as Sam Stout pulled out of his lightweight bout against perennial title contender Dennis Siver. The reason for Stout’s withdrawal is unknown, but Stout suffered a loss in his personal life on August 14, when his longtime friend and coach Shawn Tompkins tragically passed away. UFC officials worked quickly though and called upon Donald Cerrone, a man never willing to back down from a fight, to replace Stout against Siver.

The bout changed has been confirmed by the UFC.

The always exciting and active “Cowboy” is quickly working his way up the lightweight ladder in the UFC. Winner of five straight, Cerrone recently defeated Charles Oliveira at UFC on Versus 5, crumpling the Brazilian lightweight with a body shot before finishing him with a barrage of strikes. The finishing performance pocketed Cerrone an extra $65,000 for “Knockout of the Night.”

The former WEC title challenger will have his hands full against Siver, who is on a four fight win streak, and in the mix for a potential title shot. Siver is coming off a closely contested decision victory over Matt Wiman at UFC 132.

UFC 137: St. Pierre vs. Diaz is scheduled for October 29 at the Mandalay Bay in Las Vegas, Nevada. The show will be headlined by UFC welterweight king Georges St. Pierre defending his belt against former Strikeforce welterweight champion Nick Diaz.