Organizers of the Tokyo Games are scrambling to make last-minute changes to the Olympics opening ceremony after one of its music composers resigned due to his past boasts about abusing schoolmates with disabilities.

The bombshell resignation of Keigo Oyamada, who is better known as Cornelius, is the latest in a litany of setbacks to hit the Games, which are slated to kick off Friday.

“I’m now painfully aware that it was inconsiderate of me to accept an offer to contribute music to the Tokyo Olympics and Paralympics,” Oyamada said in a statement issued after he tendered his resignation from his role Monday evening. “I apologize sincerely.”