After Ruth left the Yankees following the 1934 season, Gehrig finally had a chance to take center stage, but it was only one year before a new star appeared, Joe DiMaggio. The team won an unprecedented four straight World Series titles from 1936 to 1939. For most of 1939, however, they had to do it without Gehrig, who took himself out of the lineup on May 2 and retired due to amyotrophic lateral sclerosis, which was later known as "Lou Gehrig's Disease" in his memory. The Yankees declared July 4, 1939 to be "Lou Gehrig Day", on which they retired his number 4, the first retired number in baseball. Gehrig made a famous speech in which he declared himself to be "the luckiest man on the face of the earth." He died two years later on June 2, 1941.