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FLATLANDS, Brooklyn — The 37-year-old man who tracked, ambushed and gunned down a correction officer in Brooklyn was sentenced to 40 years to life in prison for the murder, officials said Wednesday.

Keon Richmond had dated Alastasia Bryan before he shot her five times on Dec. 4, 2016, District Attorney Eric Gonzalez said. She was headed to work at Rikers Island when he killed her. Richmond shot her in the chest, hand and both arms.

“This defendant’s calculated, cold-blooded murder cut short Officer Alastasia Bryan’s promising life and robbed her family and friends of a beloved daughter, sister, companion, colleague and friend,” Gonzalez said. “With today’s substantial prison sentence, this defendant will no longer be a threat to anyone else in our community.”

Richmond placed a tracking device on Bryan’s car three days before the shooting. He fled the scene in a car registered to his girlfriend. Two days after the shooting, the girlfriend paid to have the car stored at a mechanic’s shop, where Richmond removed the car’s license plates.

The girlfriend pleaded guilty to first-degree hindering prosecution and will be sentenced on March 25, 2020.

Richmond was convicted of second-degree murder and two counts of second-degree criminal possession of a weapon on Oct. 21, 2019.