This Day in Wrestling History

Happy Birthday to Ron Simmons
May 15, 1958

The Sheik defeats Bobo Brazil for the Detroit NWA United States Heavyweight Title in Detroit, Michigan, ending and beginning both men's ninth reigns.
May 15, 1976

The WWF(E) debuted at the Houston Coliseum forthe first time. The venue was a long-time stronghold of promoter Paul Boesh, who did commentary for the event. Ted DiBiase, who had just signed for the Million Dollar Man role, made his first appearance in seven years for the WWF(E) here, cutting an in-ring promo announcing he was now part of the company. The One Man Gang came out for his match and a physical issue was teased, since DiBiase had been a babyface in the market and hadn't yet been introduced as the persona he's known worldwide for these days.
May 15, 1987

WWF(E) broadcast Raw as part of a three episode TV Taping in Binghamton, NY. The taping featured Hunter Hearst Helmsley, the future Triple H, in his Raw debut. Hunter Hearst Helmsley pinned John Chrystal at 3:10 with a standing Diamond Cutter.
May 15, 1995

Shawn Michaels resigned as WWF(E) Commissioner and Ric Flair defeated Jeff Jarrett for the WCW Heavyweight title and his 15th Heavyweight title reign.
May 15, 2000

partial source: pwinsider.com