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ST. CHARLES, MO (KTVI) - Prosecutors in St. Charles County have charged the mother of an infant girl with abuse and second degree murder stemming from an incident last December.

The grim and chilling details were released Monday.

In an amended complaint against Jessica Lynn Howell, 25, prosecutors now allege that she knew her boyfriend, Jordan Lafayette Prince, had previous convictions for sexual offense against a minor.

Prince is currently awaiting trial for first degree murder in the death of four-month-old Ashlynn Lilith Peters on December 3, 2012. Police allege that Prince strangulated Ashlynn after sexually assaulting her.

The complaint against Ashlynn’s mother, Jessica Howell, alleges she had sent text messages to Prince suggesting her willingness to allow him to engage in sexual activity with Ashlynn.

"In those text messages she suggested and encouraged some unspeakable things," St. Charles Prosecuting Attorney Tim Lohmar said. "It is very, very disturbing."

The complaint goes on to allege that Howell took Ashlynn to Prince’s home to spend the night at the time Ashlynn was murdered.

It was a trailer at Deerfield Village in St. Charles County. Neighbors said they were shocked.

"I saw them take the baby in and out, but you never imagine something like that is going on," John Ezell said. "I am glad she is charged."

Howell is in custody and held on $1 million bond. She will be arraigned Tuesday morning. Prince remains in custody as he awaits trial for Ashlynn’s murder.

Neighbors said they hope both are convicted.

"I hate to see baby killers go free," Ezell said.

Read the complaint here [WARNING! Graphic Content] - Jessica Howell Complaint