 A response by "Nixon" writers Steven Rivele and Christopher Wilkinson stated that DiMona, Haldeman's ghostwriter, had confirmed that it was Haldeman's conclusion that "the Bay of Pigs thing" was a code for the Kennedy assassination.In his post-White House years, he went on to a successful career as a businessman, taking an interest in hotels, development, real estate, and chain restaurants in Florida.On November 12, 1993, after refusing medical treatment in accordance with his Christian Science beliefs, Haldeman died of abdominal cancer at his home in Santa Barbara, California.