On the evening of December 10, 2018, Gregory Phillips, a 25-year-old Black man, was fatally shot in the Mattapan neighborhood of Boston. He was found inside a vehicle outside 155 Savannah Avenue with multiple gunshot wounds and was pronounced dead at the scene at about 9:59 p.m.

Surveillance footage showed two males exit a van and walk toward Phillips’s car; one of those men was later identified as Marcus Ambrosio. The video shows both men leaving camera view, then multiple shots being fired into the vehicle. After the first volley they ran back to the van, drove past Phillips’s car and fired additional rounds before fleeing. Ballistics testing later tied firearms recovered under the Fellsway Bridge in Somerville to the shots that killed Phillips. Cell tower records placed Marcus Ambrosio near the bridge on December 12, 2018.

Marcus Ambrosio has been identified as a suspect; the identity of the second male has not been publicly released. Did anyone in the Mattapan area see the van or those men that night or have information about the second participant?