Authorities responded to the shooting around 10:30 p.m. near the 900 block of W. Tennyson Road.
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Police say the teen was pronounced dead at the scene.
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The other victim was taken to a local hospital with non life-threatening injuries.
No arrests have been made.
Both victims are residents of Hayward.
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Police say the identities are being withheld at this time.
Anyone with information related to the homicide is asked to call Detective Purnell at 510-293-7176.