Authorities say the drivers of a Toyota Prius and Chevy Blazer died from multiple trauma in a crash that killed three others and injured four in Livingston County's Green Oak Township.
The Washtenaw County medical examiner's office on Tuesday released the cause of death for 18-year-old Matthew Kolstoe of Okemos, just outside Lansing, and 62-year-old Cynthia Skutt of Fremont, Ohio.
Kolstoe was driving the Prius Sunday when the car crossed the U.S. 23 median and smashed into the oncoming Blazer.
Kolstoe's 19-year-old girlfriend, Heather Comstock of Okemos, and 18-year-old Sarina Seger of Williamston were killed. Another passenger survived.
Blazer passenger, 56-year-old Alfred King, also was killed. Three children in the Blazer were injured.
The cause of the crash was under investigation.