Deborah Mark knew what she was doing was wrong but would lose control

Prosecutors played 2-and-a-half-hour audio recording of an interview detectives had with Dr. Deborah Mark at Monroe Carroll Jr. Children's Hospital at Vanderbilt. A Mt. Juliet detective who was part of that interview told jurors Mark often became frustrated with the child, according to News Channel 5 WTVF-TV.

"She said she knew what she was doing was wrong, but she would lose control," said Detective Bonnie Harris with the Mt. Juliet Police Department.

Harris said Dr. Mark gave them several answers about what happened before finally telling them the truth.

"She said that Kairissa had passed out so she lifted her up – one hand by her head, one hand by her butt – and walked her up to the guest room and flung her in the bedroom onto the mattress," said Harris. "Before hitting the mattress her head hit the wall."

Kairissa died the next day.

Police also noticed other injuries on the child like bruises on her back and thighs, and a black eye Dr. Mark said happened on Father's Day.

"She said she held Kairissa by the hands and slammed the ice pack into her face several times," said Det. Harris.

During the audio recording of the interview Dr. Mark said she pinched the child on the inside of thighs as discipline.

There was also an incident when the child wouldn't brush her teeth. The Marks apparently tried to pry open Kairissa's mouth with a toothbrush and knocked out a couple of her teeth.