Cause of UAE president Sheikh Khalifa bin Zayed death

The President of the United Arab Emirates, Sheikh Khalifa Bin Zayed Al Nahyan, has died. He died today the 13th 9f May at the age of 73.
A statement released by the state news agency, WAM, reads
“The Ministry of Presidential Affairs condoles the people of the UAE, the Arab and Islamic nation and the world over the death of His Highness Sheikh Khalifa bin Zayed Al Nahyan, the president of the UAE,”
Sheikh Khalifa bin Zayed Al Nahyan served in the office of the president of the UAE and Ruler of Abu Dhabi since 3 November 2004. He was elected to succeed his father, the late His Highness Sheikh Zayed bin Sultan Al Nahyan, who served as the UAE’s first president since the union in 1971 until he passed away on 2 November 2004.
Born in 1948, Sheikh Khalifa was the second President of the UAE and the 16th Ruler of the Emirate of Abu Dhabi. He was the eldest son of Sheikh Zayed. May his soul rest in peace, Amen.
What killed UAE president Sheikh Khalifa bin Zayed?
As of the time of publishing this article, the cause of his death hasn’t been disclose to newsmen. We’ll update this post subsequently.