Two men were arrested Friday on suspicion of murdering a Tokyo man and his wife, whose bodies were found in Tochigi Prefecture, in April, with one of them thought to have masterminded the high-profile killings.

Corporate executive Seiha Sekine, the 32-year-old suspected ringleader, and Ryo Maeda, 36, a real estate company executive, were arrested by a joint investigation team of the Metropolitan Police Department and the Tochigi Prefectural Police.

Sekine is the common-law husband of the first daughter of the couple. Maeda's company was managing an unoccupied house where the victims — Ryutaro Takarajima, a 55-year-old company executive, and his wife, Sachiko, 56 — are believed to have been killed.