was his wife under the tree with another man? if so then it becomes murder/suidcide were there any other cars are on the road before he hit the tree? better question is why the hell did he run into the only tree there was?
he killed his wife she was cheating on him he kills himself because he killed his wife this riddle really sounds like a murder/suidcide to me ok those are statments im getting from the questions asked now time for my questions is he married to a woman? is the man gay? is his wife gay?