(also ‘assassinator’; plural: ‘assassins‘)
a person who murders (kills) a ruler, a politician or a wealthy businessperson for political reasons or for money, usually making and carrying out a plot secretly;
a hired killer; a bravo;
(old usage) a member of a secret group of Muslims who were trained to kill Christian Crusaders or others in the past,
James Earl Ray was the assassin of Martin Luther King Jr., the human rights activist in the USA.
In the past, kings and queens were known to employ a number of assassins to kill their opponents for political gains.
John F. Kennedy, the thirty-fifth president of the USA, was assassinated by Lee Harvey Oswald, and the assassin, Oswald, was assassinated by another assassin called Jack Ruby!