Comicbook.com reports Yusuke 'Wally' Yamaguchi, known by WWE fans as manager of the Kai En Tai faction, died on Saturday at the age of 60.
Yamaguchi's health reportedly worsened after a stroke in 2017.
His reported cause of death was due to battle with a long-running illness.
Yamaguchi was a key figure in Japanese sports-entertainment during the 1980s, editing 'Gong' Magazine and working with various Japanese promotions as a referee and an agent.
WWE statement
Yamaguchi's death comes shortly after the death of King Kong Bundy, who died at 63 on March 4th.