The story is ‘sourced’, not an official statement, but it says he intentionally hit her to stop her from running. He didn’t say it was an accident.
The big caveat is that it’s sourced information.
I have read (links to the German articles) that she had injuries to her ribs plus defensive wounds, stab wounds and asphyxiation due to covering mouth and nose. Car accident injuries should be obvious, so hopefully the autopsy can rule that in or out.