Six Prince George's County teenagers were indicted Wednesday in the stabbing death of an 18-year-old man at the Woodley Park Metro Station, prosecutors said.

A grand jury charged the youths with murder, armed robbery and other offenses. One of the defendants, 17-year-old Chavez Myers, had previously been charged with murder. But the indictment alleges that all six of the teens were responsible for the death of Olijawon Griffin.

On Nov. 17, the six teens and three others robbed Griffin of his coat and hat in the 1800 block of Adams Mill Road NW, according to police. The group then went to the Woodley Park Metro Station, where Griffin and his friends approached the assailants in an effort to recover Griffin's clothing.

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, Myers snuck up from behind and stabbed Griffin once in the heart, prosecutors said.

Myers was charged with first-degree premeditated murder while armed. The other five defendants -- 16-year-old Muquan Cawthorne, 16-year-old Isaiah Gant, 17-year-old Gary Maye, 17-year-old Deon Jefferson, and 17-year-old Immanuel Swann -- were charged with felony murder. They were all charged as adults.