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Former First Lady Nancy Reagan, wife of President Ronald Reagan, has died at 94, her spokesperson announced on Sunday. The cause was congestive heart failure.

TMZ was the first to report the news. The site said it had learned of Reagan's death from "a close family member."

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Like Ronald Reagan, Nancy Reagan was an actor in Hollywood before his move into politics. They married in 1952 and remained together until his death in 2004.

While in the White House, Reagan became famous for her fiercely protective devotion to her husband and his public image; for her "Just Say No" anti-drug campaign; for her interest in astrology, which caused public embarrassment for the administration; and for her battles with several White House staffers, among other things. She also played a role in some of the more controversial aspects of the Reagan presidency, such as its indifference to the AIDS crisis. In her later years, she took up the cause of Alzheimer's and stem cell research following Ronald Reagan's death from the disease, defying the Republican Party establishment's opposition to the research.

Tributes to Reagan poured in on Sunday, including from the White House.

Read a full obituary at ABC News.

SIMI VALLEY, CA - FEBRUARY 6: Former first lady Nancy Reagan speaks during a birthday celebration held in honor of Ronald Reagan at the Ronald Reagan Presidential Library February 6, 2011 in Simi Valley, California. Ronald Reagan, the 40th President of the United States, would have been 100 years old Sunday. (Photo by Eric Thayer/Getty Images)
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UNDATED: (FILE PHOTO) Former U.S. President Ronald Reagan dances with former First Lady Nancy Reagan in this undated file photo. Reagan turns 92 on February 6, 2003. (Photo courtesy of the Ronald Reagan Presidental Library/Getty Images)
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17th July 1972: American politician, Ronald Reagan, Republican Governor of California and former filmstar, arriving at Heathrow airport, London with his wife Nancy and son Ronald Jnr. He later became 40th President of the United States of America (1980 - 1988). (Photo by Central Press/Getty Images)
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American actor Ronald Reagan and his wife Nancy Reagan smile as they have their honeymoon dinner at the Stork Club, New York City, 1952. (Photo by Hulton Archive/Getty Images)
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