This Day in Wrestling History

Henri Deglane defeats World Champion Ed "Strangler" Lewis by disqualification in Montreal, Canada after allegedly being bitten by Lewis. Deglane then claims the Paul Bowser recognized American Wrestling Association World championship and it splits off from the main line of World champions. This match has become legendary with many speculating that Deglane actually bit himself in the locker room between falls and then hid the bite until the match restarted thus getting the DQ win over Lewis.
May 4, 1931

It was announced by Vince McMahon that Andre the Giant had suffered a broken ankle. The injury was blamed on Killer Khan, setting up a series of grudge matches after Andre recovered. WWE maintained ownership of the giant cast used to set the ankle and often displays it at their annual AXXESS events.
May 4, 1981

During an edition of Smackdown in Tucson, Arizona, Jacquelyn (aka Jackie Moore) answered an open challenge from WWE Cruiserweight Champion Chavo Guerrero, defeating him with a low blow inside of three minutes to win the Cruiserweight Title, the first woman to do so since the belt became a WWE property.
May, 4, 2004

WWE publicly confirmed they were bringing the ECW brand back as a full-time entity and were signing talents to deals with the brand slated to debut at the June 2006 One Night Stand PPV.
May 4, 2006

The Necro Butcher's scene with Mickey Rourke in "The Wrestler" where they brandish a staple gun in the midst of their hardcore CZW match was nominated for the very dignified "WTF Moment" MTV Movie Award. The scene did not win, but was one of many notable mainstream media mentions for Butcher that year, including a shout-out during the Academy Awards.
May 4, 2009

Following a less than stellar run on Monday Nights, SpikeTV issued a press release that TNA Impact would be returning to Thursdays on 5/13/10. “The fans have spoken and with their input we have determined the best timeslot to maximize the TNA audience is on Thursday nights where we are confident it will be among the most-watched shows with young men,” said Brian J. Diamond, senior vice president, sports and specials for Spike TV, in the release, which also announced the addition of Reaction, a well produced series that followed up on Impact's developments. Reaction ended up running several months and in some weeks, was better than Impact.
May 4, 2010

partial source: pwinsider.com