Gunma Police Rearrest Man in Murder of Mother-in-Law

Oct 19, 2026 | News On Japan

GUNMA - Police in Gunma Prefecture rearrested a 30-year-old man on October 18 on suspicion of murdering his former mother-in-law at her home in Ota City last month, following an attack that also left the woman's eldest son injured.

The incident occurred on September 25 at a residence in Ota, where Yuka Tezuka, a 52-year-old company employee, was fatally stabbed with a knife. Her eldest son was also injured after being slashed in the head and suffering other wounds.

The suspect, Riki Mihara, 30, the former husband of Tezuka's eldest daughter, fled the scene following the attack. He was subsequently arrested on suspicion of attempting to murder Tezuka's eldest son.

Gunma Prefectural Police rearrested Mihara on October 18 on suspicion of murdering Tezuka as investigators continued to examine the circumstances surrounding the attack.

According to police, Mihara entered the house through the front entrance and concealed himself in the first-floor living room, where he waited for Tezuka to return from an outing. He allegedly stabbed her with a knife after she arrived home.

During questioning, Mihara admitted to the allegations, telling investigators, "That is correct."

Police are continuing to investigate the circumstances leading up to the killing.

Source: TBS

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