Mark Lombardi is hardly a biographer. He was an artist who liked to draw giant org charts of conspiracies, and a bit of a nutball to boot. He did indeed commit suicide by hanging in 2000.
J. H. Hatfield, is the author of Fortunate Son which is indeed about Bush. The book was never published by the original publisher when it became known that Hatfield has a felony conviction for paying a hitman $5,000 to blow up his boss. Needless to say, his credibility took somewhat of a nosedive. He overdosed on pills in 2001.
Danny Casalaro died in 1991, three years before GWB ever held elected office. (It’s also not surprising that this guy appears on a number of the “Clinton Death Lists” as well. Which one offed him? It’s a conspiracy!)
Gary Webb shot himself in the head in 2004. But Webb was most known for his thorough and sometimes dubious investigations of the Iran-Contra scandal and the CIA’s involvment in it, and never, as far as I know, published a biography of GWB.
Danny Casalaro died in 1991, and I found him on a “Clinton Body Count” page. I guess he was a bipartisan murder victim! It’s good to see the left and right coming to together on at least some issues…