Chief Warrant Officer Charlie Morgan of the New Hampshire National Guard died on Sunday. She was 48.

Morgan was a vocal advocate for equal recognition and benefits for families headed by gay and lesbian couples.

Allyson Robinson, executive director of OutServe-SLDN, announced Morgan's passing in a statement.

“Chief Warrant Officer Charlie Morgan, a courageous fighter for our country, for her family, and for the equality of all who wear the uniform of our nation, passed away early this morning. On behalf of her wife Karen and daughter Casey Elena, we thank all those who have supported Charlie so fervently since she proudly came out on national television on the day 'Don't Ask, Don't Tell' was repealed, and who have stayed by her side through her brave fight with cancer. She made an indelible mark on everyone she met with her integrity, her positive outlook, and her unflinching commitment to righting the wrongs visited upon gay and lesbian military families. The fight for full LGBT equality in this country is forever changed because Charlie Morgan took up the cause,” said Robinson.

The Morgans are plaintiffs in a lawsuit challenging the constitutionality of the Defense of Marriage Act (DOMA), which prevents the military from recognizing the legal marriages of gay couples.

Because of the law, Morgan's wife is not entitled to survivor's benefits following Morgan's death.

Last year, Morgan met with House Speaker John Boehner, a Republican from Ohio, to ask him to drop his legal defense of DOMA.

“In 2008, I was diagnosed with breast cancer and underwent a double mastectomy and several rounds of chemotherapy to save my life,” Morgan told Boehner. “In 2010 – declared cancer free by my oncologist – I was deployed to Kuwait for one year in support of Operation New Dawn. I faithfully fulfilled my duty and returned home to my wife and our then four-year-old daughter. But last September, we learned the awful truth that my cancer has returned. It is metastatic and incurable. We don't know how long I have.”

OutServe-SLDN has set up a page dedicated to remembering Morgan.

(A video recorded by the Morgans in support of marriage equality is embedded on this page. Visit our video library for more videos.)