In the case where the body of a man with his head severed was found at a hotel in downtown Susukino and three parents and a child were arrested on suspicion of murder and other crimes, the fatal stab wound to the man's neck was a deep wound that reached close to the lungs, according to interviews with investigators.

It was also found that the 3-year-old daughter apparently broke the man's mobile phone at the hotel with a tool, and police are investigating the details of the incident, believing that she tried to destroy the evidence.

On July 7, a 2-year-old man living in Eniwa City, Hokkaido, was found dead after having his head severed at a hotel in Chuo Ward, Sapporo City, and three suspects, Runa Tamura (62), an unemployed man from Atsubetsu Ward, Sapporo City, Osamu (29), a doctor and father, and Hiroko (59), a part-time employee and mother, were rearrested on suspicion of murder on July 60.

It is suspected that Runa killed the man by stabbing her in the neck with a knife after entering the hotel with two men, and it is suspected that her parents were aware of the plan to kill her in advance.

The man had multiple stab wounds to his neck, and investigators found that the fatal wound was a deep wound that reached near his lungs.

There were no defensive wounds to be made when he resisted, and police believe that Runa attacked the man from behind with strong murderous intent.

It was also found that Runa is believed to have used a tool to break the man's mobile phone in the hotel room, and since the man's belongings were taken away from the scene and the mobile phone was not found, the police are investigating the details of the incident as they believe that they tried to destroy the evidence.