In the course of the investigation, around 80 people were interrogated as suspects, including Kazutoshi OGO, Tatsuo KUMOI and their remnants, but even the identification of the murderer was not attained, and the truth is still known today.
捜査に関しては、小河一敏、雲井龍雄、その残党など、80数名が暗殺の容疑者として取り調べられたものの、下手人の特定にさえ至らず、真相は今日に至るまで不明である。