Adenhart was a passenger in the car being driven by 20 year old Courtney Frances Stewart, a Cal State Fullerton student, when 22 year old Andrew Thomas Gallo ran a red light and blindsided them in a mini van. Stewart and another passenger, 25 year old Henry Nigel Pearson, were pronounced dead at the scene. Adenhart later died in surgery at University of California Irvine Medical Center. The other passenger in the car, 24 year old Jon Wilhite is listed in critical condition at the same hospital, but is expected to live.