2002 Montero Sport won't start
 

I have a 2002 Montero Sport that my husband was driving when he hit a deer head on. After hitting the deer he continued driving the vechicle for 2-3 miles before it cut off on him. The impact when hitting the deer pushed the radiator & fan back to the engine (Fan was touching engine) & it also busted the oil line, oil drained out everywhere. Everything was replaced & fixed, vechicle started up & mechanic cut it back off. It has never started again even though it tries. We can't figure out what is wrong....all I can think of is he has blowed the engine up! What could be the problem?