A 17-year-old boy has been charged for the alleged murder of 17-year-old Darius Brown.

The teenager died Thursday in what was first thought to be an armed robbery gone awry outside a residence near the corner of Westminster Ave. and Westover Rd. in Cote-St-Luc at about 7:45 p.m.

Montreal police's major crimes unit investigated Brown's death as homicide after an "important witness" was arrested Friday night, police officials said.

"They arrested a 17-year-old man who was detained," said SPVM spokesperson Manuel Couture on Saturday. "They questioned the man and today he appeared (via video conference) under accusation of murder.

While police initially believed the victim died after striking his head against the brick wall of the building, autopsy results showed a sharp object may have played a role in his death.

"I can't confirm how it was used," said Couture. "Was he stabbed or when he fell on the ground during the altercation? Who was in possession of this sharp object? Was it the victim or was it the suspect? Right now, I just don't know."

The suspect will appear in court on Monday. If sentenced as an adult, he could face life in prison.

A 15-year-old boy had fled the scene and was later arrested. He was released overnight and likely will not be charged.

A K-9 unit scoured the scene for evidence.