I don't know that he is going to be found guilty. He was not in the accident, so the leaving the scene of an accident (from what I understand) is not going to sick, and those charges will be dropped. From attorneys that I have spoken with, the state may have a hard time proving his careless driving and speeding was the cause of the accident and/or the death. I have heard there are discussions of plea bargains that could see the charges lowered to involuntary manslaughter with a suspended sentence, or even as low as misdemeanor reckless driving with some level of restitution payments to the victim's family.
I understand moral objections and character concerns, but if you dont want to use a draft pick cause you think he's going to jail, I'd wager some money that he will be free to play football for the NFL when it's all said and done.