Somewhere in the testimony I read that it looked like the marks of a fork. The wound was described as little holes a few milimeters apart. Maybe MacDonald used a fork to replicate multiple ice pick wounds. He probably found it was too painful to go around stabbing himself with a fork and gave up. I always wondered what could have caused the marks. He was also described as having some blood crusts on little marks on his stomach
This is Dr. Bronstein from the trial
Q Now, Dr. Bronstein, in your observing of Dr. MacDonald's body, did you have an occasion to observe anything around his navel area?
A I might have noted an abrasion there, but he had a few abrasions, kind of like a scraping of the top layer of the skin, you know, sometimes get little spotty crusts if you get a scratch; but other than that there was no other injury on his abdomen.
I wonder if he used the fork on his stomach to replicated those ice pick wounds he was talking about. But he did it so lightly that they were ignored as a wound.
Also from Dr. Bronstein-
"His hands were dirty. He was dirty; he was real dirty -- a lot of dirt under his fingernails."
Many years later an icepick was found in the well in the crawl space under the house. I also wonder if he buried the scalpel that he used to make the cut into his lungs.