DENVER -- Denver Police investigators said the mechanical inspection of the Legacy High School bus that crashed at Denver International Airport earlier this month revealed no obvious pre-crash issues.
However, police said the case remains open because investigators have not yet received the bus driver's autopsy report or interviewed the driver’s husband.
"We are trying to be respectful of the fact that the family is in mourning," Denver Police spokesman Doug Schepman told Denver7.
Bus driver Kari Chopper was killed, and 18 others were injured, when the bus slammed into a concrete pillar.
Chopper's husband, Josh Chopper, said Kari had a "very enlarged heart" and may have had a heart attack before the crash.
Kari had been a bus driver for the Adams County 12 School District since 2012.
The school district released a statement that said, "Per federal regulation bus drivers are required to undergo a DOT physical every two years. Chopper passed her last DOT physical on May 10, 2016."