New Delhi : A 67-year-old millionaire woman has been arrested on suspicion of poisoning her husband with cyanide. It seemed that her former partners had already died, in Japan's latest apparent “black widow” case.

Over the last two decades, Chisako Kakehi has been the beneficiary of a combined 800 million yen that equals to $6.8 million. According to the sources, she received the insurance money and other assets after the death of all seven men.

Kakehi's dalliance with death began in 1994 when her first husband passed away at the age of 54. In 2006 her second husband, whom she had met through a dating agency, died of a stroke aged 69, while the third marriage ended in 2008 with the death of her 75-year-old partner, said Jiji press.

A boyfriend of hers, who was believed to have been suffering from some form of cancer, died a year later whereas in 2012 her then-fiancé met his fate after collapsing while riding a motorbike.

According to the media reports, traces of cyanide were detected in his body. Kakehi was arrested Wednesday by police in Kyoto on suspicion of murdering her latest husband.

Kakkehi protested her innocence denying any involvement in his death.