Muniz was found on the floor of another room with her mouth taped shut and her pants pulled down.
The affidavit states that Muniz told police she had been sexually assaulted by an unknown male. Medical tests failed to corroborate that claim.
The affidavit states that Muniz and Grace's father were in the process of breaking up. It also uncovered evidence that Muniz had purchased duct tape at a nearby store on the day police were called to her apartment.
Muniz was being held at the Plano City Jail on $1 million bond.
http://www.wfaa.com/news/local/Plano-woman-charged-with-toddlers-murder-242498911.html