Teen accused of murdering college student

February 12, 2008 9:18:13 AM PST
Charges have been upgraded against a teenager in connection with the murder of a University of Chicago graduate student. Demetrius Warren, 17, is accused of killing 28-year-old Amadou Cisse in November. Prosecutors say Warren and three others were involved in two other robberies on the same night.

Police say Warren shot Cisse. The student from Senegal was just weeks away from receiving his doctorate in chemistry when he was killed.

Warren was originally charged with armed robbery.