After an opponent dies mid-match, a prominent MMA champion swore never to fight again and retired to run his family's company. But when his best friend dies under suspicious circumstances, he has no choice but to step back in the ring.

After an opponent dies mid-match, a prominent MMA champion swore never to fight again and retired to run his family's company. But when his best friend dies under suspicious circumstances, he has no choice but to step back in the ring.