A 24-year-old man was arrested for the fatal gang-related attack on a teenager in Brooklyn, cops said Wednesday night.

Ralief Bradford, an alleged member of the Bloods street gang, was busted for beating and fatally shooting 16-year-old Justin Richey in East New York on Sunday, according to police.

Richey, who sources said has a brother who is an alleged Crips member, was shot multiple times and died near Pine Street and Blake Avenue.

The victim was not an affiliated gang member, according to the sources, but the shooting may have been carried out as a message to his brother.

Bradford was charged with murder, gang assault, and criminal use of a firearm.