A Brooklyn woman died soon after passing out at a Lower East Side bar, police said Monday.

Emily Fayssoux, 25, was sitting on a couch inside No Fun bar on Ludlow Street at around 9 p.m. Saturday when she lost consciousness, according to sources.

A friend discovered the unresponsive woman and called 911, cops said. When police arrived, the concerned caller told them Fayssoux had been drinking and using cocaine earlier in the day, but no drugs were found on Fayssoux, according to sources.

Fayssoux was rushed to Mount Sinai Beth Israel hospital, where she was pronounced dead.

“I’ve been working bars for a long time and I’ve never seen anything like that,” said a No Fun worker who was not on-duty at the time of the young woman’s death. “It’s a tragedy.”

Fayssoux, a North Carolina native, graduated from the Savannah College of Art and Design and recently worked in fashion marketing, according to social-media profiles.