a career-ending incident while playing for the team. As a result, they had only retired two jerseys in their history during that time; Ace Bailey's #6 was retired after he suffered a career-ending head injury and Bill Barilko's #5 was retired after his disappearance and presumed death on a fishing trip (his death was confirmed years later with the discovery of the wreckage of the plane on which he was flying). The New York Yankees retired Lou Gehrig's #4 after he was forced to retire due to amyotrophic lateral sclerosis. The New York Jets did not reissue the #90 of Dennis Byrd following a career ending neck injury, and it was understood long before its formal retirement in 2012 that no Jet would ever wear it again. Similarly, after Wayne Chrebet was forced to retire after suffering multiple concussions, the Jets took his #80 out of circulation but have not yet retired it; Byrd and Curtis Martin were the most recent Jets to have their numbers retired as both were done on the same day. After Magic Johnson retired because of his HIV disease, the Lakers retired his jersey #32. In 2008, Princeton University retired the number 42 for all Princeton Tigers sports teams in honor of Bill Bradley and Heisman Trophy winner Dick Kazmaier. UCLA retired the same number in 2014 for all Bruins sports teams in honor of Jackie Robinson, who had played in four sports at the school prior to his Hall of Fame baseball career. Although Robinson never wore #42 at UCLA, the school chose it because of its indelible identification with Robinson. In 2011, Michigan Wolverines football unretired all of the numbers that it had retired to create legends jerseys worn by its best players. The unretired jerseys were Bennie Oosterbaan's No. 47, Gerald Ford's No. 48, Ron Kramer's No. 87, The Wistert Brothers' (Whitey Wistert, Al Wistert, Alvin Wistert) No. 11 and Tom Harmon's No. 98. In 2015, the Legends program was discontinued, and the numbers re-retired. On December 18, 2017, Kobe Bryant became the only player to have had two numbers (8, 24) retired by the same franchise, Los Angeles Lakers. Following Bryant's death, the Dallas Mavericks announced that number 24 would no longer be issued by the team (despite Bryant spending his entire career with the Lakers). While the number has not been issued since then, it is not honored in the