The incident is noted for the unusual state the victim was found in, in that they had been cut into 20-centimetres pieces with precision equated to that of a highly trained medical professional.
The dismembered body parts were even in size, having been cut 20cm in length and 30cm in width, which was also close to the dimensions of the trash cans in the park.
The dismemberment was noted to have been done with a high level of skill, with an electric saw likely having been used as the weapon, with the muscle having been carefully cut to the specific dimensions.
One theory posits that the trash bags containing these parts had been collected by janitorial workers the day before the discovery of the rest of the body, and taken to a waste disposal center.
One witness claimed that they saw a man who resembled "S" being beaten by two men by a department store near his house, with another stating that later, at 4:00 A.M, they saw two men in Inokashira Park displaying suspicious behavior and carrying plastic bags, though it is important to note that there were no signs of physical battery on the body, which calls the former account into suspicion.
While the case initially attracted the attention of Japan's mass media, the crash of China Airlines Flight 140 occurred on the 26th of April, 3 days after the murder.
However, as the dismemberment of "S"'s body had been so meticulous, requiring not only someone with medical knowledge, but access to an industrial water supply, the most common theory is that "S" had fallen afoul of an organized crime group in the area, as they would have had the resources to carry out such an attack.
"K" feared the organization would realize their mistake if he immediately revealed himself, and thus left the line of work and kept his own account quiet for years afterwards.