TOKYO (AP) — Japanese police raided the home of a 67-year-old woman to look for traces of poison Thursday after arresting her on suspicion of killing her husband, one of about half a dozen former husbands or partners of the suspect who have died.

She has denied involvement in the deaths.

Kyoto prefectural police arrested Chisako Kakehi on Wednesday after cyanide was found in the body of her 75-year-old husband, according to Japanese media reports. They were married one month before he died in December 2013, the reports said.

On Thursday, police raided her home in Muko City in Kyoto, western Japan, and her apartment in nearby Osaka. Investigators have confiscated capsules and wafers to wrap powdered medicine, as well as books on drugs, reports said.

Police also sent Kakehi to the prefectural prosecutors' office for questioning, a legal process before prosecutors press formal charges.

Kakehi had reportedly married three times and had relationships with three others over the past 20 years, and all had died within a few years of marrying or starting relationships with her.

Cyanide has also been found in the blood of a 71-year-old partner who fell while riding a minibike in 2012, Kyodo News service said. His death was initially attributed to heart disease.

The media reports suggested that she could have killed the men for insurance or inheritance money, but that could not be confirmed. The deaths occurred in the western Japan area around the cities of Kyoto and Osaka.