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| Sakamoto Family Murder | |
|---|---|
 Sakamoto family cenotaph | |
| Location | Isogo-ku, Yokohama, Japan |
| Date | November 5, 1989 3:07 a.m. – 3:20 a.m. |
| Target | Sakamoto family (3 people) |
Attack type | Mass murder, home invasion |
| Weapons | Hammer, potassium chloride syringes |
| Deaths | 3 |
| Victims |
|
| Perpetrators | Aum Shinrikyo members |
| Motive | To prevent Sakamoto from suing Aum Shinrikyo |
Tsutsumi Sakamoto | |
|---|---|
坂本 堤 | |
 Tsutsumi Sakamoto (right), wife Satoko (left) and son Tatsuhiko (center) | |
| Born | 6 April 1956 |
| Died | 5 November 1989 (aged 33) Isogo-ku, Yokohama, Japan |
| Cause of death | Suffocation |
| Body discovered | March 1995 |
| Occupation | Lawyer |
On November 5, 1989, Tsutsumi Sakamoto (坂本 堤 Sakamoto Tsutsumi April 6, 1956 – November 5, 1989), a lawyer working on a class action lawsuit against Aum Shinrikyo, a doomsday cult in Japan, was murdered, along with his wife Satoko and his child Tatsuhiko, by perpetrators who broke into his apartment. Six years later, following the 1995 attack on the Tokyo subway, the murderers were uncovered and it was established that the murderers had been members of Aum Shinrikyo at the time of the crime.