I saw a dateline (I think) documentary/interview about him that was filmed just a few months before his death.
When Jeffrey was a boy I guess there was a large chest in his room, his father found it one day and asked what it was, Jeffrey said it was nothing, after minutes of arguing and such, he admitted it was porn. His father asked him to open the box, Jeffrey refused, he asked him again, and Jeffrey, a second time, refused to open it. If I remember right, Jeffrey ran away from the house for a few hours, and when he came back, his father said to just dispose of the pornography in the morning. Jeffrey said he would.
Anyway, on this show, Jeffrey explained to his father and the man interviewing him about the box, and what was really inside it. In that box was the head and (I believe it said) the genitals of a little boy.
I don't think Jeffrey was setup by anyone to be killed, he was just in the wrong place at the wrong time and probably just pissed off the other guy some how. Yes, he deserved to die, after what he did to all of those boys. He was going to die sometime in that prison cell.