Sandra Day O’Connor, the first female U.S. Supreme Court justice, whose independence on a court that was often ideologically divided made her the pivotal vote in numerous closely contested cases and one of the most powerful women of her era, died Dec. 1 in Phoenix. She was 93.
The cause was complications from advanced dementia, probably Alzheimer’s disease, and a respiratory illness, according to an announcement by the court. Justice O’Connor had said in October 2018 that she had dementia and was exiting public life.