A state appellate court turned down the request of a murdered cop’s widow to reconsider parole for Herman Bell, who was convicted of killing her husband and another NYPD officer nearly 50 years ago.

The court wrote in a ruling dated Thursday that Diane Piagentini did not have legal standing to challenge the parole board’s decision to spring the onetime Black Revolutionary Army soldier who killed Officers Joseph Piagentini and Waverly Jones in 1971.

“As the inmate/parolee and the board are the only parties to a parole determination, and the board cannot challenge its own determination, the inmate/parolee is the only person with standing to challenge … parole,” the court wrote.

Bell was sprung in April 2018 after serving more than 40 years.

Bell, Anthony Bottom and Albert Washington were convicted of luring Piagentini and Jones to a Harlem housing project with a bogus 911 call in 1971 and then assassinating them.

Bell was convicted in 1975, and had appeared before the board on seven occasions since 2004. He was rejected each time.

Before one parole request, Diane Piagentini submitted a victim’s-impact statement describing the posttraumatic stress she has endured.

After Bell was paroled, she challenged the board’s decision, arguing that it did not consider her statement.

But the court ruled that the board did, in fact, read her statement, and noted that she later changed her story from saying it wasn’t read to arguing that it was ignored.

It was unclear Thursday if she will appeal the decision.

Bell, 70, refused to show regret or remorse during the first 30 or so years of his 25-years-to-life sentence and insisted he was innocent and nothing more than a “political prisoner,” although witnesses and friends testified he openly bragged about the killing.

Finally, in 2012, Bell admitted to the board he played a part in the murders and said he’s a “peaceful” man you’d want as a friend.