Japanese death-row inmate Chisako Kakehi, dubbed the "Black Widow" after she used cyanide to kill her elderly lovers​, has died in a detention center at age 78, officials say,

Chisako Kakehi, known as Japan's "Black Widow," died at 78 in custody after being sentenced to death for murdering three elderly lovers with cyanide. Her calculated crimes shocked Japan and exposed gaps in investigating suspicious deaths.

A 78-year-old death inmate convicted of murdering her husband and two common-law partners with poison in western Japan more than a de