Her sister, mother and associates took up her case, determined to win justice for her death. Following the Peace Accords and end of the overt civil war, Guatemala was beginning to take actions to document abuses during the civil war, with testimony collected by the National Commission. Her sister Helen Mack filed a case with the Inter-American Human Rights Commission in Washington, DC and later with the Inter-American Court of Human Rights in Costa Rica. In 1993 she set up the Fundación Myrna Mack to support the prosecution and to do other work for human rights.