BOSTON, Dec. 3, 2015— A Dorchester youth has been indicted for fatally stabbing 17-year-old Mason Raymond at an MBTA station, Suffolk County District Attorney Daniel F. Conley said.

A Suffolk County grand jury yesterday returned an indictment charging RONALDO CEPEDA (D.O.B. 3/3/99) with second-degree murder in connection with Raymond’s Oct. 22 killing during a confrontation at Jackson Square MBTA station.

Cepeda has been held without bail since his Roxbury Municipal Court arraignment on Oct. 23.  The indictment moves his case to Suffolk Superior Court, where it will be adjudicated.

According to prosecutors, Cepeda exited a bus at Jackson Square station that afternoon and sat on a bench outside the station’s turnstiles.  Raymond entered the station a short time later.

A conversation between Cepeda and Raymond, who were known to one another, quickly escalated into a physical altercation during which Raymond suffered a fatal stab wound. He was rushed to Brigham and Women’s Hospital, where he died the next morning.

Cepeda was identified in part through footage captured by public safety cameras at the MBTA station.

The grand jury proceedings resulting in yesterday’s indictment were led by Assistant District Attorney Amy Galatis of the DA’s Homicide Unit.  Katherine Moran, chief of the DA’s Victim Witness Advocacy Program, is the assigned victim-witness advocate.  A date for Cepeda’s Superior Court arraignment has not yet been set.

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All defendants are presumed innocent until and unless proven guilty beyond a reasonable doubt.