Jeremy Heywood, the head of the civil service, has died aged 56.
The former secretary was appointed to the post in 2014 but retired last month after battling cancer.
He was appointed to the House of Lords and made Lord Heywood of Whitehall.
Downing Street announced he had died on Sunday morning, leading to tributes in the political spectrum.
His wife, Suzanne, described her husband in a statement as a "wonderful father" who "crammed a huge amount into his 56 years".
She said: "He saw a huge privilege to work with others in his career.
"He was always conscious of the need for civil servants to see the world through ministers" while at the same time respecting the boundaries between politicians and civil servants.
"Away from his work, he admired admiration, respect and affection in his many friends, and returned to them. Jeremy could have a conversation and loved hosting a good party. "
Leaders from across the political spectrum to the cabinet secretary.
Theresa May said: "This is extremely sad news and all of my thoughts are with Jeremy's family and friends.
"The many members of the public service and the government of the United States.
"He worked tirelessly to serve our country in the finest traditions of the civil service and he is a huge loss to British public life."
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She added: "I will always be grateful for the support he has given me personally and we will remember that he did not have the chance to offer his talents for longer in retirement."
Former prime minister David Cameron said: "He was an amazing man, brilliant civilian serving and dedicated to our country. It was a privilege to work with him. "
Mr Cameron's predecessor, Gordon Brown, also paid tribute, saying the country had lost "a leader of exceptional ability" with "unquestioned integrity" and "remarkable courage".
He added: "Jeremy Heywood was the most dynamic civilian servant of his generation, a leader who inspired confidence, whose expertise was recognized by all and whose impartiality was never in doubt."
And Tony Blair called Lord Heywood "a quite outstanding public servant and a person".
He added: "He worked with more senior officials than ever before with integrity, distinction and infinite commitment."
Lord Heywood was succeeded by Sir Mark Sedwill, who would also be able to attend Ms May's National Security Adviser.
He said: "We will miss him, we will say, and will be the poorer with his advice, leadership and extraordinary insight. He set the highest standards and challenged us to meet them. "
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