In a shock move, ex-"comfort woman" Lee Yong-soo has come out against a high-profile NGO that advocates for the victims. Photo: AFP

A woman running a shelter for South Korean victims of Japan’s wartime sexual slavery has been found dead in her home, police said Sunday, amid a corruption probe involving the facility.

Prosecutors are investigating claims that the Korean Council for Justice and Remembrance activist group misused funds meant for the so-called “comfort women” – a euphemism for the country’s World War II sex slaves.

The 60-year-old woman was believed to have taken her own life, police said.

“She came home by herself and the door was locked,” police told AFP without giving the woman’s name.

Officers said they did not believe anyone else was involved in her death.

The reason for her death was not known, but the activist group said she had been struggling with the ongoing investigation and a raid of the shelter by prosecutors last month.

“She said she felt as if her entire life was being denied,” it said in a statement.

The plight of comfort women has been a thorny issue between Seoul and Tokyo for decades and the activist group had campaigned for compensation from Japan.

Last month Lee Yong-soo, one prominent victim, accused the group and its former leader of exploiting comfort women to collect government funds and public donations.

Lee said little money had been spent on their cause, prompting an investigation by prosecutors.

The probe includes allegations that the former leader, Yoon Mee-hyang, embezzled funds to buy apartments and to pay for her daughter’s tuition in the United States.

Yoon – who left the group after winning a parliamentary seat in April – has denied all the allegations but apologised for “banking errors”.