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A fourth person has died after a collision caused by a suicidal driver who fatally shot himself while he was driving. 29-year-old Swapna Ponnambalam died Tuesday at Flagstaff Medical Center. She was in a car with her husband and her mother driving on state Route 89A Sunday when a car driven by 48-year-old Ross "Scott" Willoughby crossed the center line and struck the family's Toyota Prius head-on.Willoughby died when he shot himself before the collision occurred. Authorities say 33-year-old Moorthy Somashundarum and 66-year-old Bhuvaneswari Ponnanbalam were deceased at the crash site.