The suspect accused of gunning down NYPD officer Jonathan Diller appeared to be smiling in police bodycam video just moments after the fatal shooting, according to testimony from one of Diller’s fellow officers. NYPD Detective Derval Whyte took the witness stand in a Queens courtroom Wednesday, describing how he "watched my friend get shot for no reason" during a routine traffic stop in March 2024. Whyte went on to recount Diller’s final moments, the New York Post reported. "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." Body camera footage played for the court showed the moments officers attempted to revive Diller in the immediate aftermath of the shooting. The footage also showed a man on the ground in handcuffs who appeared to be grinning, the outlet reported.…