The head of a Tokyo foster home was stabbed to death Monday by a man who said he used to live there and wanted revenge, according to the police.

Hitoshi Tahara, 22, was arrested at the scene on Monday after the police received an emergency call from the facility at around 1:50 p.m. The home's chief, Shinya Omori, 46, was confirmed dead after being taken to a hospital.

The suspect has admitted to stabbing Omori, telling investigators he resented the time he spent at the foster home and wanted to attack anyone working there, according to the police.