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Heart-wrenching police bodycam video shows an accused cop-killer grinning on the ground in handcuffs — just moments after allegedly shooting hero NYPD cop Jonathan Diller.

The dramatic footage, played for jurors Wednesday during the Queens murder trial of Guy Rivera in the 2024 fatal shooting, came as NYPD Detective Derval Whyte broke down on the witness stand while recounting Diller’s final moments.

“I just watched my friend get shot for no reason,” Whyte testified.


  Guy Rivera is accused of fatally shooting NYPD officer Jonathan Diller. Dave Sanders Guy Rivera is accused of fatally shooting NYPD officer Jonathan Diller. Dave Sanders

  Slain NYPD cop Jonathan Diller with his wife and their child. facebook/jonnymac Slain NYPD cop Jonathan Diller with his wife and their child. facebook/jonnymac

“He’s on his back, he’s motionless,” he said of Diller. “I heard him say, ‘I’ve been shot.’ I went over to find the gunshot wound. I rolled him back and forth and found the bullet wound above his belly.”

When he was asked to describe the footage, Whyte said, “That’s the defendant. He looks like he’s smiling.”

Diller, a 31-year-old married father, was investigating a suspicious vehicle in Far Rockaway on March 25, 2024, when Rivera allegedly opened fire and mortally wounded him.


  The front page of the New York Post on March 26, 2024. New York Post The front page of the New York Post on March 26, 2024. New York Post

Rivera, who was wounded in the exchange, was wrestled to the ground and arrested.

Diller’s widow, Stephanie Diller, has been in court for the trial, surrounded by an army of NYPD cops, but left the room before any videos of her husband’s death were played for the jury.


  The scene of the fatal shooting in Far Rockaway, Queens. Wayne Carrington The scene of the fatal shooting in Far Rockaway, Queens. Wayne Carrington

On the stand, Whyte described how Rivera is seen in the footage taking off his seatbelt while being questioned by cops, then grabbing a gun and shooting Diller.


  Jonathan Diller’s wife, Stephanie, attends the trial. Stephen Yang for NY Post Jonathan Diller’s wife, Stephanie, attends the trial. Stephen Yang for NY Post

  NYPD Detective Derval Whyte testified today. James Messerschmidt for NY Post NYPD Detective Derval Whyte testified today. James Messerschmidt for NY Post

“Oh my God,” Whyte is heard saying on the video. “Dilly! Oh f—k, bro!”

He then broke down and needed two minutes to compose himself.

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