A former tax division chief in Zushi, Kanagawa Prefecture, may have been the person who leaked personal information on a local housewife that enabled a stalker to track her to her home and murder her last November, police sources said Friday.

A key focus in 33-year-old Rie Miyoshi's murder investigation is how Hideto Kozutsumi, 44, found out where she lived despite her efforts to hide any traces from the former-lover-turned-stalker, who killed himself after fatally stabbing her. The victim had married, changed her name and moved to Zushi.

Police suspect the information was leaked from the municipal government, and, based on system records, they alleged that the ex-tax division chief, who is in his 60s and was rehired to work in the same division after retirement, searched for and retrieved Miyoshi's tax information.