A seventh Prince George's County teenager has been indicted and charged with murder in November's fatal stabbing at the Woodley Park Metro Station, officials said.

Greg Whittaker, 19, of Hyattsville, was charged Wednesday with felony murder in the death of 18-year-old Olijawon Griffin. He also faces other charges in connection with the Nov. 17 incident, including several that stem from an attack on one of Griffin's friends, according to the District's U.S. Attorney's Office.

During the incident, a group of nine teenagers robbed Griffin of his coat and hat in the 1800 block of Adams Mill Road NW. The group then went to the Woodley Park Metro Station, where Griffin and his friends approached the assailants in order to recover Griffin's clothing, prosecutors said.

The assailants then repeatedly punched, kicked and stomped one of Griffin's friends. While Griffin was trying to get the group away from his friend, 17-year-old Chavez Myers snuck up from behind and stabbed Griffin once in the heart, prosecutors said.

Myers has been charged with first-degree premeditated murder, and five other teenagers have been charged as adults with felony murder. These six teens were indicted last month.