By Robert Scott. And: yes, that Sam Donaldson. I have only the faintest ghost-signature memory of this case, but the manager of Donaldson's New Mexico ranch, along with his wife and stepdaughter, "were found buried in a pile of manure," and according to the back cover, Paul's teenage son Cody was the culprit...but was he also a victim?
If you choose to find out, this PB is a solid reading copy: edgewear, a couple nicks to the cover and a bend to the bottom left in back, and the book isn't completely straight, but the spine is uncracked.