Frank Shamrock

Frank Shamrock is an American former professional mixed martial artist. Shamrock was the first to hold the UFC Middleweight Championship and retired as an undefeated champion. Shamrock was the No. 1 ranked pound for pound UFC fighter in the world during his reign as the UFC Middleweight Champion.

WIKIPEDIA

NCIS: LOS ANGELES · S1, E19

Hand-to-Hand

Sam goes undercover as a mixed martial arts fighter while investigating the murder of a Marine.
WALKER, TEXAS RANGER · S8, E9

Fight or Die

Walker goes undercover as a convict at a rough Arkansas maximum security prison to investigate guards who are staging and video taping brutal, extreme fights between the prisoners and then selling the tapes over the Internet for a hefty price.
THE CHAMPION WITHIN · S3, E5

Off and Racing

Professional racecar driver Bubba Wallace; South Korean golfer Se-ri Pak; MMA fighters Frank Shamrock and Tito Ortiz and boxing legend Sugar Ray Leonard play a round of golf; the Lexington horse school.