A third man was arrested Monday in connection with the fatal shooting of 17-year-old Raekwon Brown outside his Dorchester high school last month.

Jaden Waiters, 20, was charged Monday with one count of murder and is expected to be arraigned in Dorchester District Court on Tuesday, Boston police said on its website.

Brown, who was a junior at Jeremiah E. Burke High School, was shot to death outside the school on June 8 when the fire alarm went off just after 1 p.m. The shooting also sent two other teenage students to the hospital and left a 67-year-old woman with minor injuries from a bullet that grazed her leg.


Waiters, from Boston, is the third person to be charged in connection with Brown's death, following the arrests of 23-year-old Jonathan M. Aguasvivas of Roxbury and 24-year-old Benzy Bain of Mattapan. They were arrested less than two weeks after the shooting.

Prosecutors have not said who they believe fired the shots that killed Brown.

Members of the Boston police Fugitive Apprehension Unit, in collaboration with the US Marshals Service, located and arrested Waiters. Additional details on the arrest were not available on Monday night.

Aguasvivas and Bain, who have each spent three years and one day in state prison for firearm convictions, were charged with murder. They were arraigned in Dorchester District Court on June 22, and each ordered held without bail.

Officials said at the time that more charges could be forthcoming in the case.

Commissioner William B. Evans said finding the people responsible for killing Brown, or any "young man with his whole life ahead of him," is a top priority for Boston police.

"Clearly, in the case of Raekwon Brown, those responsible cared little about who they hurt or what lives were ruined on that fateful day," he wrote in a statement.


Suffolk District Attorney Daniel F. Conley added that getting justice for Brown and his family is an ongoing goal of his office, and its work will not stop at the suspects' arrests.

"Our goal is not just an arrest, not just an indictment, but the best and strongest case we can build, based on the most reliable evidence we can put to a jury," he said in the statement. "So if you know something — if you know someone who knows something — the time to step forward is now."

Felicia Gans can be reached at felicia.gans@globe.com. Follow her on Twitter @FeliciaGans.