The killer behind the slaying of the first female NYPD officer murdered in the line of duty was quietly released on parole earlier this month – an outrage that is “a blow to every cop,” the city’s largest police union said Sunday.

Cop-killer Darryl Jeter shot Officer Irma “Fran” Lozada, 25, twice in the head in 1984 after she and her partner chased him for stealing a straphanger’s chain on the L subway line in Brooklyn, the Police Benevolent Association said in a statement.

Jeter was convicted of second-degree murder and given a sentence of 32 and 1/2 years to life behind bars, the New York Post reports. He was sentenced before the enactment of PBA-backed legislation that made life without parole the top sentencing option for cop-killers, the union said.

Jeter had served a little more than 36 years of his sentence before he was released Dec. 7, according to state Department of Corrections and Community Supervision records.