He was often involved in non/bi partisan liberal efforts to reform healthcare and supported other "liberal" agenda's. He is not the only accidented republican that was not on board and was either accidented or suicided.
http://discostud.blogspot.com/<<snip>>
While an article in the New York Times on Saturday pointed out the danger politicians face due to their heavy air travel schedules, the death of a senator or member of Congress is still relatively rare, with only one other sitting U.S. Senator, liberal Republican John Heinz, dying in a plane crash since World War II. Heinz, who entered office as an outspoken opponent of the Vietnam War, later emerged as a strong proponent of health care, social services, public transportation and the environment. He also urged reconciliation with Cuba. He died when the landing gear on his small plane failed to function, and a helicopter dispatched to survey the problem crashed into his plane.