The Kellers were convicted of multiple charges and sentenced to 48 years in prison, but were freed in 2013 based on newly revealed information about misconduct by the prosecution and other authorities.
Bodies were allegedly unearthed in cemeteries and new holes dug to hide freshly killed animals and, once, an adult passer-by was shot and dismembered with a chainsaw.
The children recalled several plane trips, including one to Mexico, where they were sexually abused by soldiers before returning to Austin in time to meet their parents at the day care.
Following this confession, the Kellers fled the state, later explaining that their decision was based on the draconian sentences imposed on other, similarly accused day care providers.
Three years after the trial, while attending a medical seminar, Mouw said a slide presentation on "normal" pediatric hymens included a photo that was identical to what he had observed in the girl.
"There is a reasonable likelihood that (the medical expert's) false testimony affected the judgment of the jury and violated Frances Keller's right to a fair trial," said the district attorney.