(KMOV.com) -- The suspect has been identified in the stabbing death of Thearon Maxey, 19, in north St. Louis.
Police say the suspect is Maxey's 17-year-old ex-girlfriend.
Authorities say Maxey and the suspect were involved in a physical altercation when the suspect grabbed a butcher knife and stabbed the victim.
The suspect fled from the apartment and remains at large.
The investigation is ongoing.