ATLANTA – The two teenagers charged with murdering a southwest Atlanta man last week had been implicated in at least 100 other incidents, the Atlanta Police Department said on Monday.

Isaac McDaniel, 15, and Charlie McDaniel, 16, surrendered to police on Sunday. They are charged with the murder of Anthony Brooks, 50, outside a Campbellton Road Shell station on Thursday night.

“We believe the suspects got into a verbal altercation with the victim that led to the shooting,” said Atlanta Police Maj. Todd Coyt.

Brooks was transported to the hospital, but later died from his injuries.

Coyt said the brothers, who he said were “gang members,” had been implicated in other crimes including auto thefts and robberies.

“And those are just incidents within the city of Atlanta,” he said. “We believe they could have been involved with crimes in other jurisdictions.”

Residents of the community who knew Brooks said he was the kind of person who would always lend a hand. They say Brooks would often cut the lawns of elderly people in the community or help with repairs at a local barber shop in the same area.

Coyt said juvenile-related crimes such as this one are symptomatic of disciplinary issues at home.

“This is a case where we have lost two juveniles who should have been in school, and who had the opportunity to do good things with their lives,” Coyt said. “Their mother is a single parent, but there is no evidence that either one of them are registered in school.”

PHOTOS: Anthony Brooks

Stay updated on this and other stories by downloading the FREE 11Alive News app now in the iTunes store or on Google Play.