Utah Code § 76-5-104: Consensual altercation.

(1) As used in this section, "ultimate fighting match" means the same as that term is defined in Section 76-9-112.

(2) In any prosecution for criminal homicide under Part 2, Criminal Homicide, or assault as that offense is described in Section 76-5-102, it is no defense to the prosecution that the defendant was a party to any duel, mutual combat, or other consensual altercation if during the course of the duel, combat, or altercation:

(a) any dangerous weapon was used; or

(b) the defendant was engaged in an ultimate fighting match.