Authorities say the step-grandmother of an infant killed in a 2014 dog attack has been found guilty in the boy's death.

A prosecutor in Ohio says 38-year-old Kimiko Hardy was convicted Friday. The 7-month-old boy, from Indiana, was killed at Hardy's Dayton home in July 2014 after he was attacked by her pit bull mix, Busa.

The coroner initially ruled the death an accident. However, investigators later determined Hardy knew the dog was dangerous.

Authorities say the dog charged a letter carrier, causing the postal service to refuse delivery to her address. Then, weeks before the killing, it bit and attacked another dog in front of Hardy's home.

Hardy will be sentenced June 9. She was convicted on counts including involuntary manslaughter, endangering children and failure to restrain a vicious dog.