Trigg fell short twice in championship bouts against Matt Hughes during his five-fight stint with the company from November 2003 to August 2005. Trigg left the UFC on a loss to current champion Georges St-Pierre.
While away from the UFC, Trigg won seven of nine fights and is currently riding a four-fight win streak. He has also picked up victories over Jason "Mayhem" Miller for the Icon Sport middleweight title and PRIDE 2006 GP winner Kazuo Misaki.
Trigg has been fighting in recent years at middleweight, but will move back down to welterweight for his UFC return.