Authorities said Sunday that Keron Pierre, formerly of Mattapan, is to be arraigned in Suffolk Superior Court on Monday.
He’s accused of fleeing Massachusetts days after 19-year-old Anthony Peoples and Shacora Gaines and Chantal Palmer, both 20, were fatally shot in a car outside a party in Boston’s Dorchester neighborhood in March 2009.
Suffolk County District Attorney Daniel F. Conley says the 27-year-old Pierre was arrested in Trinidad on unrelated charges in 2010.
Conley says Pierre abandoned a challenge to extradition and U.S. marshals escorted him to Logan Airport where he was arrested on Friday.
Pierre faces charges of first-degree murder, armed assault and firearms offenses.