A long stretch of Fourth Street Southwest was blocked off for most of Sunday as police investigated the city's latest homicide.

It happened early Sunday morning just as the bars were closing in the Mission district.

911 operators received a flurry of calls reporting gunshots in the area. When emergency crews arrived they found one man dying in the street.

Just after 2:30 Sunday morning the sound of gunshots filled the air along 4th Street Southwest.

When police and Emergency Medical Services arrived they found one man suffering gunshot wounds.

He'd apparently been driving a black BMW convertible with B.C. plates.

There was a woman in the passenger seat.

EMS transported the man to hospital where he later died.

Police say another adult male arrived at hospital on his own and was treated for a gunshot wound. He injuries are not life threatening. He has been identified as the brother of the dead man. Police say he is cooperating with authorities.

Alex Bird arrived on the scene just as the man lay dying on the ground. "It was just mayhem; they didn't have the police lines up or anything. It's just like he whole road was completely swarming with cop cars, cops walking around trying to check everything out."

The crime scene extended for blocks, south from the BMW with a blown-out window down Fourth Street and into a back alley.

Witnesses tell CTV News they heard shots being fired in this back alley between 18th and 19th Avenues Southwest. They say when they looked out their apartment windows, the scene was chaos as people spilled out of the back alley and on to Fourth Street heading down toward 17th Avenue where the car and the victim were found."

Around a corner in the alley, crime scene investigators dust for fingerprints, look for shell casings, and mark off more potential clues to the crime including a pile of shattered glass from a car window.

This is the 19th homicide this year in Calgary. Police are not saying if the incident was gang related, but there are reports that the victim is a gang member from the Lower Mainland of B.C. known to police and the gang unit. Our sister station in Vancouver, CTV British Columbia is reporting the dead man is well-known gangster David Nima Tajali. Calgary Police will not confirm this.

B.C. police say Tajali is a well known gangster who moved to Calgary about a year ago.

CTV News has learned that his brother, Niki Tajali has since been released from hospital.

Police are asking anyone with information to call them at 403-266-1234 or Crime Stoppers at 1-800-222 -8477.

Police are especially interested in talking to anyone about two young women who were seen talking to a lone man behind a building located on the east side of the 1800 block of Fourth Street S.W. prior to the shooting.

An autopsy will be conducted on the deceased man on Tuesday.