A Queens man has been sentenced to life in prison without the possibility of parole in the slaying of a 25-year-old NYPD officer gunned down in his patrol car, right next to his partner, two and a half years ago. 

Demetrius Blackwell, a 37-year-old whom Queens Assistant District Attorney Dan Saunders had described in closing arguments as a "remorseless" man who "just doesn't give a damn," was convicted in November of murder and other charges in the death of officer Brian Moore after two days of deliberations. 

In handing down the sentence Tuesday, the judge called Blackwell a "coward" and cited "overwhelming" evidence against convicted killer as he ordered him behind bars for life. 

The young officer, who was also the son, nephew and cousin of cops, and his partner were in street clothes in an unmarked car on May 2, 2015 when they tried to question Blackwell, who was suspected of carrying a handgun. As they rode alongside Blackwell, he pulled a gun from his waistband and fired a number of shots at the officers, hitting Moore twice in the head, authorities have said. 

He died two days later at a hospital. Moore's partner wasn't hurt. 

In closing arguments following a three-week trial, prosecutors said Blackwell was primarily concerned about who won the Floyd Mayweather-Manny Pacquiao bout as Moore lay dying at a hospital. 

The defense had argued that Blackwell has severe mental health issues and was not in control of his actions. 

"Mr. Blackwell has seizures and psychosis mixtures that shows he was not responsible," his attorney David Bart argued. "He acted badly, wrongly and stupidly, but it was not intent to kill," he added. 

The judge described the defense as "convoluted" as the sentence was delivered Tuesday.