PORTLAND, Ore. (AP) – The Mercy Corps CEO has resigned two days after an Oregonian/OregonLive investigation found that executives at the global humanitarian aid group allowed co-founder Ellsworth Culver to remain in a top role after his daughter accused him of serial sexual abuse.

The Oregonain/OregonLive reports 65-year-old CEO Neal Keny-Guyer resigned Thursday. He had led Mercy Corps since 1994.

Keny-Guyer wrote in his resignation letter that if he was going to “morally own this” he would need to take the ultimate action.

The latest resignation comes after Mercy Corps was told the newspaper found that agency executives knew co-founder Ellsworth Culver had been accused of sexual abuse in the early 1990s. Culver died in 2005.

Mercy Corps this week removed tributes to Culver from its website and took down photos of him.

The Associated Press does not usually identify victims of sex crimes, but Culver’s daughter has identified herself.

Information from: The Oregonian/OregonLive, http://www.oregonlive.com