The Los Angeles County Board of Supervisors extended the reward Tuesday, which was set to expire.
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Iran Moreno-Balvaneda was hit by a stray bullet that came through his window while he played video games in his bedroom in November 2021.
Police say several shots were fired in the area when a single bullet entered the home, striking the teen.
He later died at a hospital, according to police.
"The grief and loss felt by his family, friends, teachers and community is unimaginable," said L.A. County Supervisor Kathryn Barger in a statement. "I'm extending this $20,000 reward with the hope that those involved in this shooting will be identified and prosecuted. Justice for Iran and his family must be served."
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Anyone with information is urged to contact Pasadena Police at 626-744-4241 or Crime Stoppers at 800-222-TIPS (8477).
You can also submit a tip online on the Crime Stoppers website.