This week, Walker pleaded not guilty to six counts of vehicular homicide and other charges – 34 in total, ABC News reported. His attorney, Amanda Dunn, has argued that the police did not investigate whether or not Walker swerved the bus to avoid hitting an oncoming white van. Dunn added that there is "no justice in convicting a man based on conjecture, and that is what the state wants to do."
In the initial reports following the incident, one parent claimed that Walker asked the kids, "Are you all ready to die?" just before the crash. Another parent, whose daughter died, said she repeatedly complained about Walker's behavior months prior to the incident. She said Walker would torment the students by doing things like "slamming on brakes on purpose, making all the kids hit their heads."
It was also revealed that his license was previously suspended for a month in 2014.
Authorities believe speed was a factor in the deadly incident, but have ruled out drugs and alcohol as explanations for the crash.