A 24-year-old Ohio woman will spend about two decades behind bars after she killed her mother when she hit her with a car and pinned her against a garage wall.

Anna Millette was sentenced to 21 years in prison on Tuesday for the death of 64-year-old Joyce Millette, according to local ABC affiliate WCPO . The younger Millette pleaded guilty to involuntary manslaughter and felonious assault. She was originally facing a murder charge .

The defendant's father, Richard Millette, asked the judge for compassion, saying Joyce Millette had tried to get her daughter help before the slaying.

"For nearly a decade, she fought tirelessly to secure mental health care for Anna, who had long struggled with a serious mental illness," he reportedly said. "Despite her unwavering dedication, Joyce faced ins

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