As the 55-year-old woman stopped to help Phillips, he fell forward into the street.
In her rush to help, she forgot to put her car in park and the 2004 Buick sedan rolled forward and hit Phillips, AZ Central reported.
Phillips was taken to a hospital, where he died. The Maricopa County medical examiner will determine his cause of death.
The woman was not injured, and police said she was not impaired.
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