The Amagasaki Serial Murder Incident (Japanese: 尼崎連続殺人事件) was a 2012 several serial murder and body dumping case, in which family households in Japan were tortured continuously for more than 25 years. The crimes began with the disappearance of a woman in or around 1987. At least 8 victims were confirmed to have died, mainly as a result of assault, confinement and other forms of abuse.[1] The crimes were committed mainly in Amagasaki, but also in six other prefectures, Hyogo, Kochi, Kagawa, Okayama, Shiga and Kyoto.[2]
The incident was discovered when the suspects Miyoko Sumida (Japanese: 角田美代子) and Masanori Sumida (Japanese: 角田正則) were arrested in November 2011. The cousin of the ringleader received a life sentence over the Amagasaki murders.
For at least 25 years, the woman believed to be the main suspect of this case had been living together with many others in the southeastern area of Amagasaki City, Hyogo Prefecture, building a pseudo-family not related to her by blood.[3] Although several suspicious deaths and disappearances had occurred one after another around 1987, starting with the disappearance of Woman A, the case would not come to light for many years.
However, in November 2011, a woman in her 40s who had been held captive escaped from confinement and ran to the police. Sumida was arrested on suspicion of assaulting Kazuko Oe's eldest daughter following her death. Furthermore, this case allowed for the investigation to further advance, and a series of other incidents came to light when an accessory from a separate case, who had been arrested in October 2012 (the theft of C's mother's pension), fully confessed to the crime. Shortly after, in December 2012, Sumida committed suicide at the detention center of the Hyogo Prefectural Police Department without saying much about the incident.
A joint investigation by the Hyogo, Kagawa, and Okinawa prefectural police, which had been investigating the cases based on the statements of X's accomplices, was disbanded in March 2014, which effectively ended the investigation. Eleven people, including X and her relatives, were indicted on charges of manslaughter and murder for six of the eight confirmed deaths. Trials were held for only ten of the relatives as X had committed suicide in jail. The whereabouts of three people who were close to X are still unknown. One was allegedly killed by X but the body was never found, and the other two are missing but their information was made available to the public .
Among the numerous mass murder cases in Japan, one notable feature of this particular incident is the high number of individuals arrested and referred to prosecutors, totaling 17. It was later revealed that during the "family hijacking", Sumida would take advantage of minor weaknesses and intimidation tactics to control entire families. It was also revealed that many of the victims were subjected to forced violence against their relatives, were restricted from eating, drinking, and sleeping, and were even deprived of their property and forced to break apart their families. Many of the arrested and documented persons who were taken in by X as members of her pseudo-family were also forced to be involved in the crimes. In addition, many of these members ended up becoming relatives either through forced marriages or adoption .
（List of those who were arrested, prosecuted, deceased, or claimed as a missing person.）
Born in 1948.[4]
On December 12, 2012, she committed suicide in a detention center at the Hyogo Prefectural Police Headquarters. She held absolute power within her pseudo-family, forcing her cohabitants to swear their loyalty and sanctioning those who disobeyed her. She would also take them on trips and outings. Some would take this opportunity to escape but would be persistently sought out and brought back.
She was charged with one account of manslaughter, but the charges were dismissed due to the nature of the death. However, following her death, she was charged for the manslaughter and murders of her eldest son, second son, and eldest daughter among other charges.
A "family" formed through repeated adoptions with relatives in the course of X's multiple "family takeovers", none of whom are related by blood.
A and her three children once lived in a rented room in her parents' home. By the mid-1980s, the family of four began to live together.
Around March 1998, X became involved in a dispute over the funeral of B's aunt and demanded money from her relatives.
E, who had been working for a private railway company at the time, responded to a complaint which led X to intervene in the family affairs of E's family and E's mother-in-law (F).
On November 7, 2011, Hyogo Prefectural Police found a drum can containing F's body in a rental house in Amagasaki City, and on November 26, 2011, X and others were arrested on suspicion of abandoning F's body . After hearing about this report, D's husband rushed to the Kobe District Public Prosecutors Office's Amagasaki branch and explained the incident to the police .
In August 2012, investigators from the Hyogo Prefectural Police found C hiding out in Amagasaki City under a false name. Based on C's testimony, H and N were re-arrested on charges of theft for withdrawing C and C's mother's pension without permission. During the interrogation of this re-arrest, H confessed to the murder and dumping of the body in September, and N also acknowledged H's confession .
In October, the bodies of D's eldest daughter, D's brother-in-law, and G were discovered underneath the floorboards of C's mother's house in Amagasaki City. On December 3, the body of C's mother was discovered in a farm equipment shed in Takamatsu City, and on December 5. X and seven others were re-arrested on suspicion for the confinement and murder of A's second son. On December 30, the body of A's second son was found in the sea in Okayama Prefecture .
December 12: X commits suicide inside Hyogo Prefectural Police Headquarters.
February 4, 2013: K, I, and seven others arrested on suspicion of confining and murdering D's eldest daughter .
March 6: K, I, and seven others re-arrested on suspicion of the confinement and manslaughter of G .
May 21: K, I, and six others re-arrested for the murder of A's eldest son. June 26: H, K, and six others re-arrested on suspicion of committing insurance fraud on A's eldest son . September 25: K and seven others arrested on suspicion of manslaughter of D .
On the 12th of December 2012, Miyoko Sumida committed suicide in a holding cell, whilst on suicide watch.
Since October 12, when a series of incidents were uncovered, Sumida had made several statements to her lawyers and police officers in charge of her detention alluding to suicidal ideation, saying things such as, "There is no point in living," "I want to die. How can I die?" The death of the main suspect following arrest made it difficult for investigators to uncover the truth of the case. .
On December 19, X's body was cremated in Kobe City but no relatives came to claim the remains .