Rich Crunkilton competes in the lightweight division and has fought for several promotions including the UFC and WEC. He defeated Sergio Gomez on March 26, 2008 at WEC 33. He was scheduled to face Donald Cerronne at WEC 34, but was forced off the card with an injury.  Crunkilton was forced to withdraw from his bout with Bart Palaszewski at WEC 39 because of a knee injury.  He was again scheduled to fight Donald Cerrone on June 7, 2009 at WEC 41, but dropped out due to another undiclosed injury.

Crunkilton made his return from injury at WEC 43 in October 2009 where he lost by decision to WEC newcomer Dave Jansen. Shortly after his defeat at WEC 43, Crunkilton was released from the promotion.

In his first fight since leaving the WEC, Crunkilton faced UFC veteran Carlo Prater at the Shine: Lightweight Grand Prix on September 10, 2010. He won the fight via split decision.

After a three year hiatus, Crunkilton returned to MMA and faced Akhmet Aliev at Fight Nights: Battle of Moscow 14 on December 7, 2013. Crunkilton lost the fight via KO.

Crunkilton started wrestling at the age of 11, and was the Greco-Roman, freestyle and judo state champion of Florida, before becoming at two time All America in the NCWA in college wresting.