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CHICAGO — Neighbors, friends and family gathered in the Austin neighborhood on the city’s West Side Tuesday night to hold a vigil for a teenage boy found murdered over the weekend.

There was an outpouring of grief for the family of 15-year-old Demetrius Griffin Jr.

His body was found burning in a trash bin in an alley in the 5500 block of West Cortez in the very early hours of Saturday morning.

Demetrius’ only sibling, older sister, Bre Melchor and Polynesia Sykes attended the vigil and pleaded for peace and information.

“I need your help, please,” Polynesia said.  “They’re killing our kids. You know who you are. Turn yourself in.”

Polynesia says she knew something was wrong when he missed curfew Friday night, something she says he never did.

Demetrius had just started high school.  He was a freshman at Steinmetz and had hopes of joining the swim team.

The medical examiner tells WGN News the cause and manner of the teen’s death are still being determined.

Police say no one is in custody.

They say whoever set the fire that burned Demetrius’ body beyond recognition may also have suffered burns.