Former Supreme Court Justice Sandra Day O'Connor died Friday morning in Phoenix, Arizona, the Supreme Court announced. She was 93.

O'Connor died of complications related to advanced dementia, probably Alzheimer's, and a respiratory illness, the Supreme Court said in a statement.

Chief Justice John G. Roberts, Jr., said of Justice O’Connor: "A daughter of the American Southwest, Sandra Day O’Connor blazed an historic trail as our Nation’s first female Justice. She met that challenge with undaunted determination, indisputable ability, and engaging candor. We at the Supreme Court mourn the loss of a beloved colleague, a fiercely independent defender of the rule of law, and an eloquent advocate for civics education. And we celebrate her enduring legacy as a true public servant and patriot."

This is a developing story and will be updated.