The incident happened the evening of Aug. 31 in the Mead Valley area, according to the California Highway Patrol. A 17-year-old was riding down Steele Peak Drive near Palm Street when he collided into the young child who was riding her bike as her mother walked beside her.
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Authorities say the teen fled the scene without rendering aid to the victims.
The 3-year-old was taken to the hospital where she later succumbed to her injuries. Her mother sustained moderate injuries.
The 17-year-old from Perris was arrested on Friday, the CHP said. He was booked into the Riverside Juvenile Hall on charges of vehicular manslaughter and hit-and-run causing fatal injuries.
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DEVELOPING: We will add more details to this report as they become available.