Authorities reported that Stewart was cooperating fully with the investigation.
A representative for Stewart extended Stewart's regrets about what he termed a "tragic accident."
In a statement, NASCAR said their thoughts and prayers go out to the family, friends, and fellow competitors of Kevin Ward Jr.
“We support Tony Stewart’s decision to miss today’s race and we will continue to respect the process and timeline of the local authorities and will continue to monitor this situation moving forward.”Copyright 2014 Raycom News Network. All rights reserved.