Jericho did left the WWE in 2005 after being "burned out" on pro wrestling in general. Fans missed Jericho while he was away, and he didn't accomplish much with any outside initiatives during his time away, leading him to return to WWE. When he returned in 2006, he had a new attitude and persona as a heel (bad guy). He told Vince McMahon that if he were to return, he would do so as a villain, which caused McMahon to fire his agent Bob Brown. This led to Jericho signing with Vince Russo's company, World Wrestling Entertainment (WWE). After signing with WWE, Jericho made his return at WrestleMania 22 where he defeated Shawn Michaels for the World Heavyweight Championship. He held onto the title for nearly three months before losing it to John Cena at SummerSlam. Since then, Jericho has been involved in several storylines including one with The Undertaker at TLC: Tables, Ladders & Chairs 2011. In 2012, Jericho started working independent events again and has been very successful at them. In addition, he has been using the social media platform Twitter to interact with his fans. In April 2013, it was reported that Jericho had signed with All Elite Wrestling (AEW).