Who benefits? That is the first question police ask. Jackie suspected that it was her husband’s successor who was the mastermind behind the pilot to murder JFK, says former Nixon advisor Roger Stone. Jackie said her husband believed strongly that Johnson shouldn’t become president and, int the months before his death on November 22, 1963.Jackie knew that Johnson and his cronies despised the Kennedy family and Johnson was jealous of the Camelot image of the family. Both the president and Bobby often shunned and ridiculed Johnson.