What investigation? Can you cite a news article stating whether they ran his computers and phone, including at work, his bank and credit card accounts, talked to his neighbors and co-workers, etc? If you can’t, your opinion is based on what?
Sometimes a cigar is just a cigar. But apparently some people want, need or demand that it be something more. Yes, this response was meant for you and while it may seem a non sequitur, it is not.