Edith Edie Windsor, the LGBTQ activist and lead plaintiff in a landmark Supreme Court marriage equality case, died Tuesday at age 88, The New York Times reports .

Windsor came to national prominence after she sued the federal government for not recognizing her marriage to her late first wife. Her case, United States v. Windsor, ultimately made it to the Supreme Court in 2013. In a 5-4 decision, the court ruled that Section 3 of the Defense of Marriage Act, which said the legal designation of spouse applied only to marriages between a woman and a man, was unconstitutional. The ruling was a major victory for LGBTQ rights and helped pave the way for a later Supreme Court ruling legalizing same-sex marriage nationwide.

Windsor is survived by her wife, Judith Kasen-Windsor, whom she married in October 2016 .