According to Japanese media, Osaka Prefectural Police arrested the suspect Monday night after the incident was discovered the same night near the pedestrian riverside area of Ebisu Bridge crossing Dotonbori River in Chuo Ward of Osaka City.

The pedestrian riverside area of Ebisu Bridge crossing Dotonbori River in Chuo Ward of Osaka City.

Investigators said the suspect and victim had been drinking near the scene before their conversation escalated into a quarrel, resulting in the scuffle.

The victim was then beaten and kicked into Dotonbori River.

Rescuers had rushed him to hospital shortly after they were informed by locals, though he died later the same night.

An autopsy revealed the cause of death was suffocation due to drowning, with many bruises recorded to the victim's head and neck.

The suspect had left the scene immediately after committing the crime. He was found later in Nishirari Ward of Osaka City.

Osaka Police had on Tuesday confirmed the victim as a 22-year-old Vietnamese citizen in their statement sent to the Consulate General of Vietnam in Japan.

His family in Hanoi said he had studied in Japan from 2019.

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Source: VnExpress