He sent a letter to President Barack Obama this morning — available after the jump — consisting of a single sentence (Souter did it with two):
Having concluded that it would be in the best interests of the Court to have my successor appointed and confirmed well in advance of the commencement of the Court’s next Term, I shall retire from regular active service as an Associate Justice, under the provisions of 28 U.S.C. § 371(b), effective the next day after the Court rises for the summer recess this year.
This means Obama will have his second opportunity to make an addition to the Supreme Court. U.S. Solicitor General Elena Kagan is considered by many to be the frontrunner for the nomination.