Please support your claim. Please read the interview with his wife. Oh wait, let me guess, she was in on it too? I’ve really never understood those who come up with the way they want things to be and then make the facts fit it rather than using logic and good common sense. Probably because people who believe conspiracy theories lack a great deal of both.
There's a very good probability that she was! One important piece of evidence: on the day before the death, the victim gave his personal secretary two envelopes to mail from the WH which his wife gave him before leaving home. One contained a check for a premium to a life insurance company that kept his policy intact. That payment enabled Wifey to collect handsomely after the death. Another envelope contained legal papers to the victim's mother which signed over her oil leases to Vince. Upon V's death, those oil leases wound up in the possession of Wifey. Now think about that. Were both of those mailings at precisely that time just fortuitous for Wifey? Or was she engaging in some "financial planning"?
In general, please note that it is not illogical to believe in a conspiracy theory in cases such as this where a conspiracy is the only way to explain the evidence.