Note the person who put up the $100k reward said this:
He said he was contacted by a man in his 60s, claiming to be a former US intelligence officer, who claimed ‘it [the murder] was arranged by the Russian government at a very high level’.
Burkman went on to say: ‘He just said he had knowledge it was arranged by the Russian government and stressed that it was at a high level.
‘I’ve met this person and he seems very credible. We’re now investigating the allegations he has made.’
The ride he refused was offered by Joe Capone - the man who visited the White House a few days earlier who was the last person to see Seth prior to the shooting.