The Boston Police Department reports Nicholas Fomby-Davis, 14, of Dorchester, was shot repeatedly in front of 218 Bowdoin St., around 8 p.m. Sunday. He died at Boston Medical Center.

A gang-unit police officer who happened to be in the area watched him get shot and began running after two suspects, as he called for backup. Police say both were apprehended and a gun was seized.

Crisostomo Lopes, 20, of Dorchester, was charged with murder. A 16-year-old, not identified because of his age, was charged with unlawful possession of a firearm, unlawful possession of ammunition and discharging a firearm within 500 feet of a dwelling.