Maury has a stroke.

Notice at the end when he's driving and singing "Country Girl" the left side of his face is all twisted up and his mouth is distorted? That's a sure sign of a CVA or stroke. Brought on by too much ETOH, narcotics and stress. Maury was a completely selfish and ignorant lout. I doubt anyone was grief stricken over his demise. And how come the kid who was his acting driver was in such a hurry at the end? Maury was obviously dead. He wasn't banged up too badly either. Great movie though. Some of it was very funny too.