THORNTON, Colo. (CBS4)– What led to the death of the driver in a deadly bus crash remains a mystery. The coroner’s autopsy report on Kari Chopper doesn’t answer a critical question about the investigation.
The coroner’s report states that Chopper died of injuries suffered when the bus struck a concrete pillar. The coroner was not able to determine whether she had a medical issue that led to the crash.
The coroner previously had told Kari’s husband that she had an enlarged heart and may have had a heart attack.
The Legacy High School Varsity and JV football teams were leaving DIA on buses after returning from a game in California on Sept. 11. Chopper somehow crashed into a concrete bridge in the passenger pick up area and was killed. Fifteen students were taken to the hospital. Three coaches were seriously injured.
Bus drivers are required to undergo a Department of Transportation medical exam every two years. Kari passed a physical exam in May. She worked for the Adams 12 School District for four years and her husband said she loved her job.