Crunkilton made his professional MMA debut in October 1999, defeating Ray Totorico via TKO. Following this, Crunkilton would compile a record of 8-0 before signing with the World Extreme Cagefighting promotion in 2002.
World Extreme Cagefighting
Crunkilton made his debut on June 7, 2002 at WEC 3, defeating Cruz Gomez via first-round TKO. He then made a quick turnaround and faced Luciano Oliveira at WEC 4 on August 31, 2002. He won the fight via armbar submission. Crunkilton then defeated Victor Estrada at on October 18, 2002, due to an ankle injury.
With an impressive undefeated record of 11-0, Crunkilton signed with the UFC and faced Hermes França at UFC 42 on April 25, 2003. Though Crunkilton was the moderate favorite coming into the fight, he would lose the fight via unanimous decision and was subsequently released shortly after.
Return to WEC
Following a short stint in the UFC, Crunkilton returned at WEC 15 on May 19, 2005, defeating Paul Jenkins via KO. He faced Nick Ertl at on January 13, 2006. He won the fight via TKO, advancing his WEC to 5-0. He then faced Adam Lynn at WEC 21 on June 15, 2006. He won the fight via rear-naked choke. Crunkilton won his next fight against Mike Joy at WEC 25 onJanuary 20, 2007, via D'arce choke. Crunkilton lost his first fight in the WEC on September 5, 2007, when he lost to Rob McCullough via TKO for the WEC Lightweight Championship at WEC 30. He defeated Sergio Gomez on March 26, 2008 at WEC 33. He was scheduled to face Donald Cerrone 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 undisclosed injury. Crunkilton made his return from injury at WEC 43 where he lost by decision to WEC newcomer Dave Jansen. Shortly after his defeat at WEC 43, Crunkilton was released from the promotion.
Post-WEC
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.
