Peter Liang, who faces more than 15 years prison in the death

Peter Liang, who faces more than 15 years prison in the death of Akai Gurley, was done in by his partner, Officer Shaun Landau, the sources said. They called Landau’s grand-jury testimony the key to notching the top charges.

“I don’t think you would have any case against Liang without the testimony of Landau,” a law-enforcement source told The Post.

“The case that was presented, you needed Landau because there were only two people involved. The case hinged on Landau.”

Liang, 27, pleaded not guilty Wednesday on charges including manslaughter, criminally negligent homicide, assault, reckless endangerment and official misconduct, for shooting Gurley, 28, while on a “vertical patrol” in the high-rise Louis Pink Houses in East New York on Nov. 20.

Liang had his service pistol drawn, his finger on the trigger, when he opened a stairwell door with the same hand and his weapon went off.

Landau argued with Liang over what to do next but never called for backup or an ambulance himself, prosecutors said. Neither cop tried to resuscitate Gurley as he lay dying, they said.

“[Liang] retreated back to the eighth-floor hallway he’d come from and said to his partner, ‘I’m going to be fired,’?” prosecutor Marc Fliedner said.

“For the next four minutes, as Mr. Gurley’s companion frantically sought a neighbor to call 911 and help her take care of Mr. Gurley, stop the bleeding, keep him breathing, the defendant stood on the eighth floor with his partner, refusing to call the shooting in to his superiors.”

Landau attorney Michael Cibella, Liang attorney Stephen Worth, and a spokeswoman for the DA all declined to comment.

BOTH GUILTY!!

Source AP