WASHINGTON (AP) -- Justice Sandra Day O'Connor, the first woman appointed to the Supreme Court and a key swing vote on issues such as abortion and the death penalty, said Friday she is retiring.

O'Connor, 75, said she expects to leave before the start of the court's next term in October, or whenever the Senate confirms her successor. There was no immediate word from the White House on who might be nominated to replace O'Connor.

It's been 11 years since the last opening on the court, one of the longest uninterrupted stretches in history. O'Connor's decision gives Bush his first opportunity to appoint a justice.

"This is to inform you of my decision to retire from my position as an associate justice of the Supreme Court of the United States, effective upon the nomination and confirmation of my successor. It has been a great privilege indeed to have served as a member of the court for 24 terms. I will leave it with enormous respect for the integrity of the court and its role under our constitutional structure."