The murder happened on Black Friday 2015.
A second man who was seriously injured during the shooting was the prosecution's key witness in the case against Robert Hansley, 29.
Jurors returned a verdict after deliberating for about six hours, three hours Wednesday afternoon and three hours Thursday morning.
Defense attorney Hunter Tzovarras said "Well we're disappointed the jury saw it the way they did. Particularly that there was an eyewitness who saw Mr. Ferguson firing the shots."
Earlier this year, a judge found Thomas Ferguson, 38, of Brooklyn, New York, guilty of being an accomplice in what prosecutors referred to as an ambush execution.
Prosecutors said the shooting was motivated by bad blood between former drug dealing partners.
Assistant Attorney General Bud Ellis said "We obviously felt they were both guilty. And we think the evidence was quite compelling against both of them. We feel justice has been served with this verdict."
The defense maintained Ferguson was the shooter. Plus, the defense painted a picture of Hansley as a man who feared Ferguson and was under the older man's control.
The jury, though found Hansley guilty of murder and aggravated assault. Tzovarras stated "We were hoping that both would be not guilty verdicts based on the fact that it was the co-defendant who was firing the shots."
During the five and a half day trial, jurors heard hours of testimony and viewed dozens of exhibits. Their decision may have come down to the testimony of the man who was shot six times and lived to testify. "I mean from our point of view we felt the testimony of the surviving victim was extremely crucial." said Tzovarras.
The defense attorney said he'll be asking the judge for a light sentence, while the prosecutor said it's too soon to talk about what they'll recommend for a sentence.
Within minutes after the jury returned its guilty verdict, defense attorney hunter Tzovarras said they will appeal that decision.