Popular British journalist and television host David Frost, known for his hard-hitting 1977 interviews with former U.S. President Richard Nixon, has died, his family said Sunday. He was 74.

Sir David Frost, who spent most of his career with the BBC, died Saturday night from a heart attack aboard the luxury cruise ship Queen Elizabeth, where he was scheduled to give a speech.

Prime Minister David Cameron sent his condolences to Frost's family, calling the journalist "my friend and a feared interviewer."

Frost, who was also a comedian, became famous for his interviews of leading political figures over a 50-year television career.

Former Prime Ministers Margaret Thatcher and Tony Blair, late Palestinian leader Yasser Arafat, former South African President Nelson Mandela and former U.S. President Bill Clinton were among the figures interviewed by Frost.

The journalist hosted many television shows over his long career, including "Breakfast with Frost," "That Was The Week That Was" and "Frost on Sunday."

Frost, born April 7, 1939, in Tenderden, Kent, England, worked mostly for the BBC but also had shows on ITV and the Al Jazeera network. EFE