A 35-year-old woman was slashed to death with a broken bottle while trying to protect her beau from a deranged mob during a massive caught-on-video Sunday morning brawl outside a Bronx nightclub.

The mayhem erupted shortly after 4 a.m. outside the Mama Dora club on East Kingsbridge Road when a fight began between two groups as the bar emptied out, law-enforcement sources and witnesses told The Post.

With fists flying, one combatant — identified by locals as the woman’s husband — hit the ground, prompting her to step in to try to protect him from his attacker, according to witnesses. 3

That’s when she was stabbed — with the fatal melee caught on surveillance footage.

What appeared to be a woman’s hair extension was left behind on the sidewalk, along with shattered glass.

“They wer

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