Looking for a movied that was based on a true story in the early 80's if I'm correct.

It's about a boy who was murdered. Only thing I really remember which is very distorted he was driving a volvo van and picked up a man. But I could be all work about this. I remember scene of his mom looking in his room and I do believe had lots of sisters and brothers.

Sorry not very clear of what's it about but that's all I remember.