The daytime shooting inside a Trenton laundromat that killed a young man and wounded another was carried out by three shooters ranging in age from 15 to 74 who all used the same handgun, one after the other, prosecutors said Tuesday.

The incident began after a group of people beat up a 37-year-old man who later turned into a suspect when he took the gun from the woman who started off the retaliatory gunfire: a 74-year-old woman known in Trenton as “Mama Dean."

Killed in the 12 p.m. Monday shooting on the 200 block of Chambers Street was Geovahnie FanFan, 21, who was shot by two suspects. A 16-year-old boy was wounded and survived.

Darryl Parker, 37, and a 15-year-old boy are charged with murder and weapons offenses. Eudean McMillan, 74, of Trenton, the woman known as “Mama Dean,” is charged with attempted murder and weapons offenses as an accomplice in the killing, the Mercer County Prosecutor’s Office said Tuesday.

The prosecutor’s office said the shooting started after a small group of people kicked Parker to the ground near the entrance of Liberty III Laundromat and threw objects at him.

Surveillance video shows McMillan left the laundromat before the beating and returned with a handgun. She shot at the attackers as they fled the building, the prosecutors office said. The 16-year-old was struck by the gunfire while FanFan fled to hide in the laundromat’s office area.

McMillan then handed her gun to Parker, who walked to an open counter area near the office and fired at FanFan through a large window, authorities said.

As Parker and McMillan were leaving the building, the 15-year-old suspect took the gun and again fired at FanFan multiple times as he lay on the ground, the prosecutor’s office said.

Police on the scene at Liberty III Laundromat on Chambers Street in Trenton Sept. 16, 2019 investigating a double shooting. Trenton Sgt. Anthony Manzo is in the center, with sunglasses on his head.Michael Mancuso | NJ Advance Media for NJ.com

All three fled the scene in McMillan’s car, the prosecutor’s office said. McMillan and the 15-year-old are related, while Parker and McMillan are acquaintances.

McMillan was identified as an alleged shooter by Trenton police Sgt. Anthony Manzo, who was in the first group of officers to arrive at the scene. He spotted McMillan on the laundromat’s security system, and told detectives exactly where to find her, police at the scene said.

Manzo had arrested McMillan in July 2016 during a drug investigation, which city police alleged at the time that she was selling pain pills from the front of her nearby home, on Chestnut Avenue, media reports and police say.

During that arrest, officers found a a .38-caliber handgun and a sawed-off shotgun. The status of that case was unclear Tuesday.

Parker was released from the state prison system in May after serving about 14 years for multiple counts of robbery, in Mercer County.

McMillan and Parker are currently being held in Mercer County Correction Center. The 15-year-old is being held in Middlesex County Juvenile Detention Center. All await court appearances.

Avalon Zoppo may be reached at azoppo2@njadvancemedia.com. Follow her on Twitter @AvalonZoppo. Find NJ.com on Facebook. Reporter Kevin Shea contributed to this story.

Get the latest updates right in your inbox. Subscribe to NJ.com’s newsletters.