A 21-year-old man has reportedly admitted to stabbing a high school girl following a dispute over online games, after her body was found hidden in a closet at his home in Aichi Prefecture.

Masaki Eguchi, an unemployed man from the city of Ichinomiya in the prefecture, was arrested on Monday for abandoning the body of 16-year-old Waka Kato from Tokyo’s Katsushika Ward in a closet on the second floor of his home.

According to the Aichi Prefectural Police, an autopsy revealed that the cause of death was hemorrhagic shock, and she was presumed to have died on Sunday. Numerous stab wounds and cuts were found on the back of her head, the back of her neck and her back, leading investigators to believe Kato was attacked from behind.

Eguchi admitted to the charges and was referred to the Public Prosecutor’s Office on Wednesday, NHK reported.

Kato went missing after saying on Friday she was going to the home of a friend she met through online gaming. She was last heard from on Saturday morning, and her mother filed a missing person report the same day.

The body was found on Monday when the police visited Eguchi’s house, where he lives with his parents, after tracking the victim’s smartphone location.

Further investigations from the police revealed that Eguchi had made statements after his arrest hinting he had murdered the girl, NHK reported.

Eguchi told investigators he met Kato at his home, where they got into an argument about online games. He then stabbed her in his room with a kitchen knife he had at home, according to NHK.

Eguchi is also suspected to have logged into one of the girl’s online accounts from his own smartphone and sent messages posing as the victim to inform people around her that she was safe to prevent the incident from being discovered, NHK reported.

The broadcaster also said the suspect and victim had been in contact through online battle games.