Actress Minnie Driver has stood down from her role as a celebrity ambassador for Oxfam.
This follows claims that staff for the charity in Haiti and other countries paid vulnerable people for sex.
In a statement Driver said that she was “nothing short of horrified” by the allegations.
Oxfam said it was “grateful” for Driver’s commitment and that it was “more committed now than ever to learn from our mistakes”.
The British charity is accused of concealing the findings of an inquiry into claims staff used prostitutes while delivering aid in Haiti in 2011.
The actress, best known for the films Good Will Hunting, Grosse Point Blank and Hope Springs, said that although she could not continue her 20 years of involvement with Oxfam, she would work against “social and economic injustice”.