Boy, 16, Held Without Bail in MBTA Stabbing Death

A 16-year-old juvenile was ordered held without bail Friday on a murder charge stemming from a fatal stabbing at the Jackson Square MBTA station in Jamaica Plain, Suffolk County District Attorney Daniel F. Conley said.

Ronaldo Cepeda, of Dorchester, was arraigned in Roxbury Municipal Court on a charge of fatally stabbing Mason Raymond Thursday afternoon. Although he is a juvenile, Massachusetts law mandates that all murder defendants aged 14 or older are charged as adults.

Cepeda and Raymond, who knew each other, got into a fight outside the MBTA station around 3:20 p.m. During the altercation, investigators said Cepeda produced a knife, held it behind him so Raymond could not see it. When they engaged again, Cepeda stabbed Raymond.

The 17-year-old victim, of Hyde Park, sustained a single stab wound to the chest, penetrating his heart. He was rushed to Brigham and Women’s Hospital, where he died of his injuries at about 4:30 Friday morning.

Boston Police homicide detectives, assisted by MBTA Transit Police and footage from public safety cameras at the station, obtained a lead on the suspect’s identity early in the investigation.

Investigators said Cepeda was arrested at his home Friday morning, given his Miranda rights, and interviewed in the presence of an adult family member. He allegedly made incriminating statements in the course of that interview.