MATTAPAN— A 16-year-old male was arrested in connection with a shocking homicide that left a teenager dead last summer in Mattapan. The arrest took place at District E-13 in Jamaica Plain around 12:26 PM on November 21, 2025.

Authorities report that the suspect was wanted on several serious charges, including murder, assault with a firearm, and carrying a firearm without a license. This dramatic turn of events highlights the ongoing investigation into a chilling incident that occurred on July 5, 2024, when police responded to reports of gunfire near Gladeside Avenue and Donwood Terrace.

Upon their arrival, officers discovered two victims inside a vehicle suffering from gunshot wounds. One victim was transported to a local hospital with non-life-threatening injuries, while the other, identified as Christian Cousins, 17, of Stoughton, was pronounced dead shortly after.

The police have labeled the circumstances surrounding this case as particularly grave, and the investigation remains active as the Homicide Unit continues to piece together the events leading up to this tragedy.

Anyone with information regarding the case is strongly urged to reach out to the Boston Police Department's Homicide Unit at (617) 343-4470. Community members can provide tips anonymously through the CrimeStoppers Tip Line by calling 1-800-494-TIPS or texting "TIP" to CRIME (27463).