Mesa police say the unidentified teen appears to have only had a learner's permit to drive and could be facing charges for fleeing the scene after the Wednesday afternoon accident.
Police say the 15-year-old has been taken into custody in the hit-and-run crash but showed no obvious signs of impairment.
They say other juveniles also were in the truck at the time of the fatal collision.
The name of the 22-year-old man who was killed hasn't been released yet.
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