The mourning mom of slain NYPD hero cop Jonathan Diller glared at her son’s accused killer in a Queens courtroom Tuesday — but the thug didn’t have the guts to look her in the face.

Guy Rivera, 35 — who allegedly fatally gunned down the 31-year-old officer and married dad during a 2024 car check in Queens — wore a surgical mask and crouched down for the procedural hearing, refusing to face mom Fran Diller, who had dozens of New York’s Finest there supporting her. 7

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Rivera even had to be told repeatedly to pull down his face mask so witnesses on the stand could identify him.

The hearing was part of a “Dunaway” proceeding before a murder trial that establishes whether police had probable cause to approach and arrest a defendant.

As part of Tuesday’s hearing, three NYPD cops tes

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