A deadly shooting on Staten Island two years ago has gone unsolved — and now police are asking for help before the case goes cold. NY1's Clodagh McGowan has the story in this crime stoppers report.

Police are asking for help solving a two year old, deadly shooting on Staten Island.

Just after 7 a.m. on a warm, July morning in 2015, a Sunnyside resident was walking his dog on Alpine Avenue when he found a man lying on the curb with a gunshot wound to his torso.

The resident summoned the police and 33 year-old James Hall was then pronounced dead at the scene.

Investigators say he was shot hours before. 

"The people in the neighborhood didn't expect anything like this to happen," said Detective Kenneth Fung of th NYPD. "There were no calls to 911 at the time but after canvassing we later found witnesses that heard what appeared to be fireworks but later assumed to be gunshots."

Detective Kenneth Fung is heading the investigation for the Staten Island Homicide Squad. Police are revisiting the July 19 shooting by talking to neighbors and interviewing people they first spoke with two years ago. Detective Fung says the investigation spans multiple states.

"We are also visiting other cities, as well as other states in search for witnesses," said Detective Fung.

Detective Fung said the quiet tree-lined block is an unlikely location for a shooting and believes an altercation started elsewhere and then escalated.

"Our theory is the victim was a passenger in a car, was driven down this quiet dark block, possibly an argument ensued, we believe he was shot while in the once in the car and then he tried to flee from the car and then was shot once more."

Detective Fung said he speaks to the victim's mother regularly and hopes he'll soon have more information to share with her by bringing her son's killer to justice. 

"Something that the regular person might think is something small, it might be big for us, to lead us in our investigation," said Detective Fung.

Anyone with information on the case should contact the Crime Stoppers hotline at 1-800-577-TIPS, or text CRIMES and then enter TIP577, or visit www.nypdcrimestoppers.com. All calls are anonymous and there is a cash reward if it leads to an arrest and indictment.