K-9 Diller met Officer Diller's wife, Stephanie, and young son, Ryan, on Thursday.
The NYPD Chief of Transit released photos showing Ryan petting K-9 Diller and posing at the bureau.
Det. Diller was fatally shot during a traffic stop in Far Rockaway, Queens on March 25.
The NYPD says Guy Rivera, 34, was in the passenger seat of a car when he pulled a gun and shot Diller, 31, through the window. Rivera was then shot in the back by Diller's partner.
Prosecutors said he then "attempted to cause the death of Sgt. Sasha Rosen" by shooting again but his gun jammed.
Rivera, 34, was indicted on first-degree murder, attempted murder, and criminal possession of a weapon charges in the fatal shooting of Diller.
He faces up to life in prison without the possibility of parole if convicted. He remains remanded into custody and will return to court on July 22.
READ MORE: New video of suspects linked to vandalism in NYC
Video shows suspects linked to vandalism across New York City
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