For which organization was Audrey Hepburn a special goodwill ambassador?

Audrey Hepburn (4 May 1929 – 20 January 1993) was a British actress, model, dancer and humanitarian. Recognised as a film and fashion icon, Hepburn was active during Hollywood's Golden Age.

Born in Ixelles, a district of Brussels, Hepburn spent her childhood between Belgium, England and the Netherlands. In Amsterdam, she studied ballet with Sonia Gaskell before moving to London in 1948, continuing her ballet training with Marie Rambert, and then performing as a chorus girl in West End musical theatre productions.

Hepburn appeared in fewer films as her life went on, devoting much of her later life to UNICEF. She had contributed to the organisation since 1954, then worked in some of the poorest communities of Africa, South America and Asia between 1988 and 1992. She was awarded the Presidential Medal of Freedom in recognition of her work as a UNICEF Goodwill Ambassador in December 1992. A month later, Hepburn died of appendiceal cancer at her home in Switzerland at the age of 63.