Robert Francis "Bobby" Kennedy (November 20, 1925 – June 6, 1968), commonly known by his initials RFK, was an American politician from Massachusetts. He served as a Senator for New York from 1965 until his assassination in 1968. He was previously the 64th U.S. Attorney General from 1961 to 1964, serving under his older brother, President John F. Kennedy and his successor, President Lyndon B. Johnson.