Tyrrell served for over 45 years in the Australian Public Service. For most of this time he was assistant secretary or personal secretary to a succession of Ministers including the
Prime Minister,
Ben Chifley. Tyrrell succeeded Rear Admiral
Sir Leighton Bracegirdle as
Official Secretary to the Governor-General,
William McKell, in March 1947. Tyrrell also served McKell's successors
Sir William Slim,
Lord Dunrossil,
Lord De L'Isle,
Lord Casey and
Sir Paul Hasluck. The Queen named him a
Commander of the Royal Victorian Order for his service rendered during the Royal Visit in 1954. He was also appointed a
Commander of the Order of the British Empire in 1959. Tyrrell had a small but pivotal role to play in the establishment of the
Australian Conservation Foundation. The ACF began in the second half of 1964, after a suggestion was made to Tyrrell by
The Duke of Edinburgh while visiting Australia in 1963. He voiced an idea that Australia could become involved in conservation by establishing a branch of the
World Wildlife Fund. Tyrrell convened a meeting that came to the conclusion that, if a conservation body was to exist, its efforts should be directed at conserving Australia's own heritage. From this the ACF emerged. Tyrrell was appointed a
Knight Commander of the Royal Victorian Order in 1968, during Lord Casey's term. This was awarded for personal service to the Queen, and was not on the recommendation of the Prime Minister. He had been attached to
The Royal Household at
Buckingham Palace from May to August 1962. After his retirement in 1973, he was succeeded by
David Smith. In 1977, he was named the
Australian of the Year, jointly with
Dame Raigh Roe. Tyrrell lived at 11 Blundell Street,
Queanbeyan,
New South Wales, in an old heritage cottage still called "Sir Murray Tyrrell's Cottage". He was an Alderman of the
Queanbeyan City Council from 1976 to 1980. Tyrrell died on 13 July 1994 in
Canberra at the age of 80. ==Honours==