TMZSports.com

UFC star Donald "Cowboy" Cerrone is so obsessed with "Red Dead Redemption 2" -- he's even dressing like the characters for a little fight week inspiration.

UFC star Donald "Cowboy" Cerrone is obsessed with Red Dead Redemption 2 'cause he LOVES killin' people in cold blood -- so much that he's dressing like main character Arthur Morgan.

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