Baseball History on June 15 from the Baseball Almanac

Baseball history on June 15, including every baseball player who was born on June 15, died on June 15, made their debut on June 15, and ended their big league career on June 15, by Baseball Almanac. — www.baseball-almanac.com
The Baseball Almanac website carries a plethora of June 15 events like:
1928 - Ty Cobb, 41 years old, steals home for the 54th and final time.
1931 - Cut-down day for major league rosters brings the retirement of Eddie Collins and Harry Heilmann.

This Day In Baseball June 15 - This Day In Baseball

The ThisDayinBaseball.com website provides dozens of June events including these gems:
1902 - Nig Clarke reportedly hits eight home runs for Corsicana against Texarkana.
1925 - Al Simmons caps an amazing 13 run comeback with 2 out 3 run homer.
1952 - Cardinals set record for coming back after being down 11-0.
1962 - Hank Aaron and Roberto Clemente trade grand slams in a wild battle between the Braves and Pirates.
1976 - A shake up in Oakland gets a Commish Veto.

June 15 Baseball-Reference Bullpen

The BR Bullpen of Baseball-Reference.com events for June 15 and among the many are:
1923 - Lou Gehrig makes his Major League debut with the New York Yankees as a pinch hitter.
1938 - Johnny Vander Meer of the Cincinnati Reds stuns the baseball world by pitching his second successive no-hitter in five days.