A 68-year-old woman arrested by Kyoto Prefectural Police on Nov. 19 in connection with the cyanide poisoning of her husband has been charged by Kyoto prosecutors with his murder.
Chisako Kakehi was charged with causing the death of Isao Kakehi, 75, on Dec. 28, 2013, at the couple's home in the city of Muko, Kyoto Prefecture.
Investigators said traces of cyanide were discovered on a sachet found in a plant pot that Kakehi had asked a recycling service to dispose of earlier this year.
Kakehi has so far denied the allegations, but sources close to the investigation said she has been "wavering" over the past few days.
Osaka police are also probing whether Kakehi was involved in the death of another of her former partners, a man from the town of Kaizuka in Osaka Prefecture who died in 2012 at age 71. Cyanide was later detected in samples of his blood.