Which one? Akira Tohei Sensei or Koichi Tohei Sensei?
Akira Tohei Sensei passed away in July 1999.
I heard Koichi Tohei Sensei is semi-retired and recently announced that his son, Shinichi Tohei Sensei is the successor to head the Ki no Kenkyukai. I'm sure others on this site can provide more detailed information about him.