 He entered a feud with Ken Shamrock over the WWF World Heavyweight Championship which culminated at where Michaels retained the title after Shamrock won by disqualification after being attacked by D-Generation X members Triple H and Chyna.Michaels would lose the WWF World Heavyweight Championship to Stone Cold Steve Austin at WrestleMania XIV before being forced into a four-year retirement after suffering a serious back injury during a casket match against The Undertaker at the 1998 Royal Rumble.Michaels would not recover and wrestle again until 2002.