Former Kansas City Royals closer Dan Quisenberry, now a member of the San Francisco Giants, decides not to go on the disabled list and opts to retire as the all-time American League saves leader with 238.

On April 29, 1990 — Former Kansas City Royals closer Dan Quisenberry, now a member of the San Francisco Giants, decides not to go on the disabled list and opts to retire as the all-time American League saves leader with 238.

Source
Baseball Reference April 29