Durrell Patrick Law, 20, was shot in chest during a robbery in the parking lot of the Fairview Apartments on the afternoon of Jan. 20, 2014 and died, according to police.
Three of the suspects were juveniles at the time and their court documents are sealed, New Haven Police said.
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The adult suspect, Joel Alexander 23, is a convicted felon charged with felony murder, first-degree robbery, firearms crimes and conspiracy to commit first-degree robbery, according to police.
Alexander's bond was set at $2 million.
All three juveniles, who are from New Haven, have been charged with murder, felony murder and robbery. Two the the juveniles had been incarcerated before for unrelated crimes, police said.