Windsor died in New York. A cause of death was not given, but she had struggled with heart issues for years, the Associated Press news agency reported.

Gay rights activist Edith Windsor, whose same-sex marriage fight led to a landmark US ruling, has died aged 88.

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Her death was confirmed to the New York Times by her wife Judith Kasen-Windsor.

Windsor's Supreme Court case struck down the Defense of Marriage Act in 2013, granting same-sex married couples federal recognition for the first time.

She had sued the US government after being ordered to pay $363,053 (224,940) in federal estate tax after her previous wife, Thea Spyer, died.

The couple had been partners for 44 years and had married in Canada in 2007.

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Ms Windsor at the New York Gay Pride Parade in 2013

Windsor, known as Edie, argued that the provision of the law which defined marriage as between a man and a woman prevented her from getting a tax deduction due to married couples - and was unconstitutional.