Who killed Ron and Nicole?

[Jack White]

I always read between the lines for clues on many things.
A between-the-lines activity of OJ attorney Barry Scheck
was that he began a non-profit activist group of law school
students called THE INNOCENCE PROJECT immediately after
the OJ case, to help free wrongly convicted prisoners, many
of them on death row. I think he saw how easy it was for
someone to be wrongly prosecuted.
...
Jack

Good point. I previously assumed that Barry Scheck started The Innocence Project to feel better about himself for representing a clearly guilty OJ. But now that I realize OJ didn't do it I see it differently of course.

How could Jason Simpson let his father suffer so much for his crimes?

As Dear pointed out, he has always depended on his father
to get him out of jams. This was no different. In many ways
he was very childlike, and had a child's view of stepmom Nicole as
belonging to him. Lots of jealousy and anger...leading to rage.
If he confessed, the death penalty was likely, unless an insanity
plea worked. He had always taken from OJ; this was just another
case of it.

Jack