Watch UFC star Derrick Lewis destroy boxer who trash-talked him in the gym in CCTV footage of brutal KO

UFC star Derrick Lewis revealed hidden CCTV footage of him battering a "s*** talker" in the gym with a brutal KO.

Lewis is one of MMA's hardest hitting heavyweights and decided to get his own back on the boxer who Lewis claimed had given him lip.

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The footage shows Lewis mercilessly laying into his opponent with a barrage of blows before the unfortunate chap eventually goes down.

Lewis tweeted the footage alongside the caption: "When a boxers said he will knock me out because I'm an MMA fighter."

And he also posted on his Instagram with a different caption that read: "When a boxer comes to my gym talking s***... HE'S OK."

ESPN journalist Ariel Helwani also tweeted: "Asked Derrick about this.

"He said a boxer at his gym was talking 'a lot' of smack about boxers vs MMA fighters.

"This happened yesterday. Lasted one minute, he said."

Fans online were quick to jump on the footage with some people not happy with Lewis for continuing to punch his opponent when he was down.

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One posted: "Few dirty digs when he was out cold."

To which someone added: "He's an MMA fighter, they do that all the time."

Tat2Gary added: "Close round. I think Lewis took it though - Every MMA judge."

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