By Sandra Birungi

World’s oldest woman, Koto Okubo has died aged 115, a Japanesse official confirmed.

Okubo, who became the world’s oldest woman just a month ago lived a town near Tokyo. She died Saturday at a nursing home in Kawasaki City, according to city official Mitsuhiro Kozuka. The cause of death is not known after her relatives refused to release it, according to the official.

Okubo was born Dec. 24, 1897 and was named world’s oldest woman after the death of Dina Manfredini of the United States who was at the time the holder of the title. Manfredini died within two weeks after earning the title. Jiroemon Kimura, a 115-year-old man in Japan’s ancient capital of Kyoto, inherited that title. He was born on April 19, 1897.