Suleiman later left Egypt and went to Abu Dhabi with his relatives. He died in the US where he was undergoing medical tests at the age of 76.
The 79-year-old Nayef, who was also the long-serving interior minister of Saudi Arabia, traveled for medical reasons to a few countries including Algeria and the United States this year before he was announced dead on June 16.
Nayef was announced the new heir to the Saudi throne after the death of his full brother, former Crown Prince Sultan bin Abdul Aziz, at a New York hospital on October 22, 2011.
A prominent US-based Journalist, Fareed Zakaria says the US Central Intelligence Agency (CIA) is behind the death of former Egyptian vice president and the country's long-time spy chief Omar Suleiman, and Saudi Crown Prince Nayef bin Abdul-Aziz Al Saud.
Speaking in a TV program called Al-Haghigheh in an Arabic satellite channel, Zakaria said that Omar Suleiman made a phone call to him few minutes prior to his death claiming that his life was in danger and the CIA had targeted him with a laser radiation.
Zakaria added that Suleiman revealed to him in the same telephone conversation that the Saudi crown prince was also assassinated with a similar laser radiation by the US spy agency.
Several days before Egypt’s former dictator, Hosni Mubarak ouster, Suleiman was appointed vice president in January 2011 when the revolution gained momentum. He was directly involved in the killing of protesters.