Written by: Brian Pryor

Tucson Police investigators are trying to determine what caused a 2005 Toyota Scion to crash near Miracle Mile and Flowing Wells, killing the driver.

Officers responded to the collision just before Noon, when they arrived the found the vehicle had crashed into a guardrail.

Inside the vehicle emergency crews found three persons with serious injuries, the driver 80 year-old Bernette A. Robison later died at the hospital due to injuries sustained in the accident.

Two other adult passengers were transported to a local hospital where they remain in critical condition.

Detectives believe that the collision occurred when the driver suffered a medical episode.