At the time of the original charges, prosecutors didn't have the report from the Wayne County Medical Examiner's Office. It was later determined that the girls' death wasn't an accident, medical officials said.
The girl's death was ruled a homicide after medical officials said she died from abusive head trauma and blunt force trauma to her chest.
The original case was dismissed and Smith faced new charges including felony murder, torture, first-degree child abuse and second-degree child abuse.
Smith was scheduled to face a jury trial earlier this month. However, he pleaded guilty to second-degree murder.
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