Japanese police on Wednesday handed prosecutors the case of a suspect for arson and murder at an Osaka clinic in December that killed dozens of people.
Charges are unlikely as the suspect is already dead and investigations will end, leaving the motive for the attack unclear.
The incident happened Dec. 17 at a mental health clinic on the fourth floor of a building in the Kita district of Osaka, western Japan.
Police say Tanimoto Morio, 61, is the suspect in arson and murder, which left 26 people dead.
They say security camera footage shows flames engulfing the clinic after Tanimoto sprayed gasoline and set it on fire.
The suspect died Dec. 30 while hospitalized with severe carbon monoxide poisoning he suffered during the incident.
Police suspect Tanimoto planned the attack and carried it out with a strong intent to kill. But they say they found no evidence of trouble between the clinic and the man.
Police said Tanimoto hadn’t had any friends for several years until the incident and had no savings left.
Police believe that after isolating himself from society and running out of money, Tanimoto decided to kill other people when he took his own life.