Two additional teenagers have been charged with murder for the death of Chad O’Connor, a 17-year-old who was beaten and shot to death on Kenwood Street on Jan. 14.

Malik Albert of Dorchester and Rodney Gamble of Lynn, both 17, were arraigned on Monday morning in Dorchester Municipal Court for their alleged roles in the attack. They join Rishaard Sheppard and Branden Singleton-Legget, who were arrested last month for the same crime. O’Connor was surrounded and attacked by a group of men. A gun recovered from Sheppard’s home last month is a ballistic match to the murder weapon, according to Suffolk County District Attorney Daniel F. Conley. Sheppard is alleged to have fatally shot O’Connor in the head. The other young men were charged with kicking O’Connor. Judge Jonathan Tynes ordered Albert and Gamble to be held without bail on Monday.

Prosecutors say they have video evidence that shows the attack and implicates Albert and Gamble, who are due back in court on March 14.