An NYPD detective who was working security near the Park Avenue building where a madman killed four people had her reputation dragged through the mud in the aftermath of the slaughter.

Online rumor mongers claimed Det. Shareka Henry fled the scene when bullets were flying, police sources said, but the rumors were false.

At the time, Henry, 39, was working for a private security firm that covers 345 Park Ave. and 601 Lexington Ave, which is a block away. 6

She was at the Lexington Avenue building when Shane Tamura marched into 345 Park. with an AR-15 style assault weapon and opened fire. The victims included Henry’ Brother in Blue, Det. Didarul Islam.

“She saw Officer Islam being carried out,” a source involved in the investigation said. “She had seen him an hour earlier and got

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