SPRINGFIELD, Mass. (AP) – A 24-year-old Boston man was shot to death in Springfield after he left a friend’s birthday party.

David Santana, of Boston’s Roxbury neighborhood, died of a gunshot wound to the chest after the shooting at 2 a.m. Friday under the Interstate 91 overpass, police Capt. William J. Noonan said.

The minivan in which Santana was riding was about to get on I-91 and drive south to Connecticut, Noonan said.

Santana was pronounced dead at Baystate Medical Center. A passenger in the van, Gabriel Santana, 24, of Bristol, Conn., suffered a minor gunshot wound to the thigh. The relationship of the two men was not immediately clear.

There were no arrests. Noonan said police had not immediately learned the motive in the shooting, Springfield’s 15th homicide of the year.

The killing came less than two days after another Springfield homicide in which Gregory Holmes, 22, was shot Wednesday afternoon during an argument over a drug deal.

The man charged with killing him, Roy D. Dancy, 21, of Springfield, was arraigned on Friday in Springfield District Court on charges of murder, possession of a firearm without a license and discharging a firearm within 500 feet of a dwelling. Dancy pleaded innocent.