I noticed the link you posted is to a “List of Dead Scientists”. The John Wheeler referenced in the article I posted is a West Point and Yale graduate. His background is military and legal, and would not be thought of as a scientist.
I wonder if the person compiling the list had this guy in mind...
http://www.freebase.com/view/en/john_archibald_wheeler
He seems to believe that scientists who are involved with research or specialize in bio weapons or counter agents are being targeted and he has listed those who have died or been killed in support of that theory.
My guess is that Jack Wheeler, while not a scientist, apparently made his list due to both the unsolved mystery aspect of his death and for the work he has done and was possibly doing.
Your post reminded me of the website and his being on the list. From that website:
John (Jack) P. Wheeler III, 66. last seen Dec. 30 found dead in a Delaware landfill, fought to get the Vietnam Memorial built and served in two Bush administrations. His death has been ruled a homicide by Newark, Del. police. Wheeler graduated from West Point in 1966, and had a law degree from Yale and a business degree from Harvard. His military career included serving in the office of the Secretary of Defense and writing a manual on the effectiveness of biological and chemical weapons, which recommended that the United States not use biological weapons.