Thomas , I have read many books on the assassination and you get to where certain aspects of what someone knew and of who someone might have been , you have to make a guess of what you think you are dealing with . There seems to be so many people in the mix of the assassination and I think where there's smoke , there's fire . Marina is still alive , so why doesn't someone find out ? It's quite obvious that with what goes on in the KGB , FBI and the CIA are so plentiful that we would never know the truth . J. Edgar Hoover knew about LHO in 1960 or before . George H. W. Bush was sent a letter from Hoover within days of the assassination and of course Bush always denied being CIA . Hoover knew way more than just about anyone and Hoover probably knew as much about Marina as anyone . My original answer was " No " and I'll stick with that until there is proof and we know how hard it is to tell the truth . Mafia people were said to not ever write anything down because the trail of paper could sink you . Marina , who knows ?