The brutal, bloody fight was Trigg's first attempt to defend the title he won from Jason "Mayhem" Miller last year. With the victory, Lawler becomes Icon's first two-time middleweight champion.

Lawler staggered Trigg with an overhand right in the second round. One minute and 40 seconds into the fourth, Lawler connected on a devastating left hook, right hook, left upper cut combination that sent Trigg sprawling.

As the referee jumped in to stop the fight, Lawler caught the prone Trigg with another right hook.

"If it was Niko (Vitale) I wouldn't have done that, because Niko's the man and he has respect," Lawler said. "Trigg has no respect."

In the undercard, Jason "Mayhem" MIller made short work of Hector Urbina with a knockout 1:11 into the first round, and Charuto Verrissimo pummelled Lars Haven en route to a first-round knockout.

Also, former "The Contender" participant Jeremy Williams scored a third-round TKO over Charles Jones when a beaten and exhausted Jones couldn't continue, and Po'ai Suganuma took a third-round decision over Nate Carey.

Results

Dwayne Haney def. Devon Damo (2nd rd. submission-choke)

Ryan lee def. Jay Bolos (3rd rd. dec)

Scott Anderson def. PJ Dean (3rd rd. dec.)

Kimo Woelfel def. Derrick Keasley (3rd rd. dec)

Kala Hose def. Ron Verdadero (1st rd. KO)

Justin Buchholz def. Marshall Harvest (1st rd. KO)

Jeremy Williams def. Charles Jones (3rd rd. TKO)

Po'ai Suganuma def. Nate Carey (3rd rd. dec)

Jason "Mayhem" Miller def. Hector Urbina (1st rd. KO)

Robbie Lawler def. Frank Trigg (4th rd. KO)