The sumo assault case of former yokozuna Harumafuji was handed to prosecutors on Monday as the Japan Sumo Association continued its own investigation of the October incident in the city of Tottori.

Harumafuji, 33, resigned on Nov. 20, ending his 17-year-long career in the traditional sport just weeks after the scandal broke. The Japan Sumo Association is expected to receive the final report of its crisis management panel on Dec. 20.

According to investigative sources, the former champ allegedly beat fellow junior wrestler Takanoiwa with his bare hands and a karaoke machine remote control while drinking at a bar in the city on the night of Oct. 25 while the wrestlers were on a regional tour. Both wrestlers are Mongolian.