Kelly Duda made a documentary video about the case, which includes interviews with some of the principals and victims, and I suppose background coverage. I have not seen it. This is the disputed video.
We do not know whether Jerry Parks was involved. Possible, but offhand, I don't see the connection. Foster's role is indisputable -- for one thing, he had a face-to-face confrontation with Galster. (It was about a different matter but confirmed the connection between Foster, then-Governor Clinton and the health services company that ran the blood scam with Clinton's active connivance and protection.)
Just what Foster did in the tainted blood scheme (I think he was the bag man) and whether this was the issue that caused his demise are more speculative. But the case is intriguing and strong.