Sir David Frost, the veteran broadcaster who famously drew a grudging post-Watergate apology out of former President Richard Nixon, died Saturday aboard a cruise ship sailing from England to the Mediterranean. He was 74.

His death, from an apparent heart attack, was confirmed in a statement his family released to the BBC.

Known for his laid-back but probing style of interviewing, Frost gained access to an astonishing array of world figures during a five-decade career. His subjects included seven U.S. presidents and eight British prime ministers, and his A-list included Prince Charles, Nelson Mandela, Billy Graham, Muhammad Ali, Orson Welles, Truman Capote, the Beatles, Henry Kissinger and Vladimir Putin.