London (CNN) - Former British Prime Minister Margaret Thatcher, a towering figure in postwar British and world politics and the only woman to become British prime minister, has died at the age of 87, her spokeswoman said Monday.
Her funeral will be at St. Paul's Cathedral, the British prime minister's office announced Monday.
Thatcher served from 1975 to 1990 as leader of the Conservative Party. She was called the "Iron Lady" for her personal and political toughness.
Thatcher retired from public life after a stroke in 2002 and suffered several strokes after that. British media reported Monday that a stroke caused her death.
She made few public appearances in her final months, missing a reception marking her 85th birthday hosted by Prime Minister David Cameron in October 2010. She also skipped the July 2011 unveiling of a statue honouring her old friend Ronald Reagan in London.
In December 2012, she was hospitalized after a procedure to remove a growth in her bladder.