Peter Zisopoulos stabbed Alison Russo 20 times with knife in an unprovoked attack in September of 2022.
Police say he left his apartment building, walked up to Russo, shoved the 61-year-old to the ground and stabbed her just steps from the stationhouse.
It took a jury just an hour on Monday, to convict Zisopoulos of second-degree murder, and criminal possession of a weapon.
"I hope this conviction brings Alison's family, friends and coworkers solace as we continue to grieve her loss," said Queens District Attorney Melinda Katz.
He will be sentenced on June 30, and faces a sentence of 25 years to life in prison.
Russo, a 24-year veteran of the FDNY, was posthumously promoted to captain.
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