SPRINGFIELD - One of three men wounded in a Sunday morning shooting at the Kick Back Lounge on State Street in Springfield has died of his injuries, police said.

Springfield Police Lt. Richard LaBelle confirmed the death shortly before 7 a.m. It is the city's seventh homicide of the calendar year. The sixth came just hours earlier when a man was shot in a common area of an apartment building on Worthington Street.

The names of both deceased men and those wounded are being withheld for the time being.

The deceased and one other man suffered serious gunshot wounds when an unknown shooter opened fire near the rear door of the nightclub as people began to stream out at closing time. A third man sustained a minor gunshot wound, according to police.

A ShotSpotter activation at 1:59 a.m. alerted police to the shooting. Officers first on the scene requested immediate ambulance service for a wounded man they found in the club's parking lot as they arrived. A moment later, a second victim was found needing medical attention. Ten minutes later, a third ambulance was dispatched to the State and Margerie streets location.

Uniformed officers and detectives found spent shell casings littering the pavement near the rear entrance to the nightclub and a black handgun was found across the lot from the doorway next to a car. Officers interviewed witnesses, but no suspect has been identified.

The incident remains under investigation.

Anyone with information is asked to call Springfield Police at 413-787-6310. Those who wish to remain anonymous may text a tip via a cell phone by addressing a text message to "CRIMES," or "274637," and then beginning the body of the message with the word "SOLVE."