Every year for the last seven years, Yolanda Williams has visited the 77th Division police station every Christmas to hang her son's picture as a reminder that his killing remains unsolved.
"They took my very special kid," she said. "I'm very hurt. This is my eighth Christmas with my son being gone."
Williams joined detectives and county officials on Wednesday to announce a $10,000 reward being offered to help find the killer of Waymon Weston, gunned down in October 2009.
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Weston was 20 years old when he was shot on west 90th Street in the Athens-Westmont area.
According to the Los Angeles County Sheriff's Department, Weston was on the phone with his girlfriend when two suspects approached him and asked about his gang affiliation.
"One suspect shot the victim, and both suspects fled in a vehicle which was later recovered," said Deputy Lillian Peck of the Sheriff's Information Bureau.
County Supervisor Mark Ridley-Thomas said detectives are determined to find those responsible and hold them accountable.
"Someone somewhere ... will know what happened," he said.