I can't speak to individual cases, it's usually impossible to determine from a news article. But realistically speaking, how many actual proven targeted assassinations of a white collar nature (ie whistleblowers) have happened in the US in the last 50 years? I think the answer is 0. The number of people who have antagonized big businesses or government and then died is pretty high, but also, everyone dies. Accusations of assassination are, in and of themselves, frequent weapons of dissenters. You can look at the cases of Vince Foster and Seth Rich as people whose deaths were deliberately exploited for political conspiracy mongering.