Did cops kill a mom who was just sitting on her stoop minding her own business? New, forensic evidence suggests that they did, during a shootout the night of the West Indian Day Parade, and an investigation is underway to see if police officers unintentionally took a woman's life.

Denise Gay was on the stoop of her building at 633 Park Place in Crown Heights, Brooklyn just after 9:00 Monday night, when a bullet struck her in the head and killed her. Just who shot the bullet is what the many people who called Gay the mom of the neighborhood want to know.

"They've got to get to the bottom of this. Justice has to be served," Woody Valdez told PIX11 News. He had been standing next to Gay on their stoop when she got hit. "She didn't deserve to go down like this."

Valdez was talking about forensic tests that show that the bullet that killed Gay was from a 9 millimeter weapon that was not a Ruger, the semiautomatic pistol used by the person that cops were actually aiming at. Eyewitnesses say that least seven officers who had been working the nearby West Indian Day Parade responded to the apartment building two doors away from Gay's after Leroy Webster, 32, came out of his building after firing at least two rounds at a man with whom he'd been arguing, Eusi Johnson, 29. Johnson ran away from the scene, but collapsed and died near a train trestle half a block away.

The NYPD says that Webster shot at the responding cops, and they shot back -- 73 times. PIX11 counted eleven bulletholes in the door, windows and facade of the building where the shootout took place. The fusillade left Webster injured, but one bullet, possibly a ricochet, killed Denise Gay.

"She brought us together," Woody Valdez told PIX11 News. "She was like mayor of the block right there." Dozens of people shared stories about Ms. Denise, as she was affectionately known. A makeshift memorial covered with signatures of neighbors and friends and surrounded with candles and flowers indicates how well-known and well-liked she was.

"She's like a Mother figure to me," Anthony Hudson told PIX11 News. Like many in the neighborhood, he blames the police for the death of the woman who lives in his mother's building, and even though the officers were firing in self-defense, many in the neighborhood say that the number of live rounds fired was excessive and deadly.

"There's got to be a way to do this without [as many] bullets fired," Lars Russell said. He lives directly across the street from the shootout scene and watched the entire thing unfold from his apartment window. "My first reaction was that it was an incredible over-response by the police," said Russell.

"There will be a grand jury investigation," Les Gay, Denise's brother told PIX11 News. "Nothing I can say will bring her back." He and Denise Gay's daughter, Tashmaya, left Gay's home Thursday afternoon with Kirsten John Foy, a top aide to the city's public advocate. Foy said that his boss, whose job it is to hold the city government accountable, want a full investigation to see if the police committed a criminal act.

The NYPD's Deputy Chief of Public Information, Paul J. Browne, says that the bullet may have been from an NYPD firearm, since police service weapons are 9-mm Glocks. However, the fatal bullet, Browne said, could also be a match for a half dozen other firearms.

Police say that the bullet may have also come from a gun carried by Eusi Johnson, the man allegedly killed by Leroy Webster. However, investigators have found no weapon that can be matched to Johnson, and people who know him say he was not armed Monday night.

Surveillance video taken from different cameras at the scene may provide more answers to the many lingering questions. Some residents and media organizations are calling for police, who have taken the video into evidence, to release it for public viewing.