Yes. He was a member of the Warren Commission and he reportedly had reservations over the official conclusions.
A lot of compelling facts to support a switcheroo.
It was quite a while ago (1972) but consider adding Hale Boggs to the list. He was Democratic House Majority Leader at the time he dies in a mysterious crash in Alaska, a member of the Warren Commission, and a reported critic of J. Edgar Hoover. Some sauce for those who may not know much about him:
http:// archive.seattleweekly.com/home/933206-129/history