What's so hard to understand? Chris was driving a pickup truck that smashed into the back of a tractor. Sending the tractor into the ditch, the gentlemen driving the tractor was taken by ambulance to the hospital where he passed away. Chris was arrested for leaving the scene of an accident.
Purely speculating here but there will likely be a few more charges since the gentlemen passed away. If they can find proof that Chris was texting and driving it would sure bring some light to the new laws recently passed.