Late in the afternoon of Saturday, March 11, 1972, Wilt Chamberlain, 35, and in the 13th season of a career that would last only one more year, began welcoming a few hundred of his closest friends to a party at his recently-completed Bel-Air mansion. Many of the guests, who included his Los Angeles Lakers teammates and a friend from the football world named O.J. Simpson, were still there as dawn broke high in the Santa Monica Mountains. Wilt himself didn't get to bed until 7 a.m., though that was not unusual for the Dipper even on, say, a routine Tuesday.