The Sonics retire Spencer Haywood's number.  Should be a Hall of Famer but the NBA won't do that since he sued them to be allowed to play in the league as an underage player.  Nowadays it's commonplace.
{"Image ImageDescription": "SEATTLE - FEBRUARY 26:Spencer Haywood after the unveiling of his retired jersey #24 on February 26, 2007 at the Key Arena in Seattle, Washington. NOTE TO USER: User expressly acknowledges and agrees that, by downloading and or using this photograph, User is consenting to the terms and conditions of the Getty Images License Agreement. Mandatory Copyright Notice: Copyright 2007 NBAE (Photo by Terrence Vaccaro/NBAE via Getty Images)", "Image DateTime": "2007:02:27 00:56:31", "Image Artist": "Terrence Vaccaro", "Image Copyright": "2007 NBAE"}