As he returns home after finding them a new house , Chris pulls over to help a stranded motorist and is struck by a passing truck , which kills him instantly .
Finally seeing that it is hopeless to help him , Cathy decides to leave Bart for good .
As Bart returns home after finding them a new house , Chris pulls over to help a stranded motorist and is struck by a passing truck , which kills Bart instantly .
Finally seeing that it is hopeless to help him , Cathy decides to leave Bart for good .