At 3 A.M. , the group entered Sakamoto 's apartment through an unlocked door . Tsutsumi Sakamoto was struck on the head with a hammer . His wife , Satoko Sakamoto ( 坂本都子 '' Sakamoto Satoko '' , 29 years old ) , was beaten . Their infant son Tatsuhiko Sakamoto ( 坂本竜彦 '' Sakamoto Tatsuhiko '' , 14 months old ) , was injected with the potassium chloride and then his face was covered with a cloth . While the two adults struggled , they were also injected with the potassium chloride . Satoko died from the toxic injection , but Tsutsumi Sakamoto did not die as quickly from the injection alone and was strangulated . The family 's remains were placed in metal drums and hidden in three separate rural areas in three different prefectures ( Tsutsumi in Niigata , Satoko in Toyama , and Tatsuhiko in Nagano ) so that in case the bodies were uncovered , police might not link the three incidents . Their bed-sheets were burned and the tools were dropped in the ocean . The victims ' teeth were smashed to frustrate identification . Their bodies were not found until the perpetrators revealed the locations after they were captured in connection with the 1995 Tokyo subway attack
1995 Tokyo subway attack
Tokyo subway sarin attack
Sakamoto family murder