Canada’s worst modern mass shooting as a gunman kills 18 people, including a Royal Canadian Mounted Police officer, across Nova Scotia.
Portuguese superstar Cristiano Ronaldo becomes first player to score 100 goals in the Champions League with a hat-trick in Real Madrid’s 4-2 win over Bayern Munich.
Wayne Gretzky (New York Rangers) played his final game in the NHL. He retired as the NHL’s all-time leading scorer and holder of 61 individual records.
John Lennon releases single “Stand by Me”.
Jackie Robinson has four hits, including a three-run homer, as the Montreal Royals beat Jersey 14-1; first black man to play in professional baseball’s all-white leagues.
Superman, the world’s first super hero, appeared in the first issue of Action Comics. The cover date was June 1938.
Yankee Stadium opened in the Bronx, NY. The Yankees beat the Boston Red Sox 4-1. John Phillip Sousa’s band played the National Anthem.
The cornerstone of the current St. Peter’s Basilica is laid in the Vatican by Pope Julius II.