Kurt Cobain
Born 1967: 1+9+6+7=23. Died 1994: 1+9+9+4=23.
April 19. As in 4-19... 4 + 19 = 23. April 19 is the date the Battle of Lexington, Waco, and the Oklahoma City Bombing...
Shakespeare was born on April 23, 1564 and died on April 23, 1616.
W is the 23 letter of this alphabet. The symbol for that letter is two points down and three points up.