A Missouri mother has been charged with child abuse and murder after police said she let her boyfriend rape her 4-month-old infant, resulting in the child’s death.

Prosecutors in St. Charles County on Monday released details about how 25-year-old Jessica Lynn Howell sent text messages to her boyfriend, Jordan Lafayette Prince, indicating that she was willing to let him have sex with her daughter even though she knew he had previously been convicted for sexual abuse of a minor.

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“In those text messages, she suggested and encouraged some unspeakable things,” St. Charles Prosecuting Attorney Tim Lohmar told KTVI. “It is very, very disturbing.”

Lohmar said that Prince sexually assaulted the infant and then strangled her to death.

“Ashlynn was sexually assaulted causing multiple tears to her anus, a massive laceration to her rectum with massive hematoma in the area of the pelvis,” the probable cause document states. “The injuries to her anus and rectum of Ashlynn were sufficient to eventually cause her death even without the strangulation.”

Howell was being held on $1 million bond and was schedule to be arraigned on Tuesday. Prince remains in jail awaiting trial for first-degree murder charges.

Watch the video below from KTVI, broadcast June 18, 2013.

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[Ed. note: A previous version of the report incorrectly stated the age of the infant.]