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BUFFALO, NY - Negligent supervision is at the heart of a recently filed lawsuit by the father of a slain five-year-old girl. Michael Tennant filed suit this week against the maternal great-grandparents of Isabella Sara Tennant.

The little girl was found dead in a garbage tote in August 2012 in Niagara Falls. She was spending the night at Sharon and Henry Lascelle's home the night of the murder. Her mom was working at a nearby sports bar.

In the suit, Michael Tennant says the great-grandparents "affirmatively created the dangerous and defective condition."

John Freeman Jr., who was 16 at the time, pleaded guilty to second-degree murder and is spending 22 years in prison. He is not named in the lawsuit. He was left to watch the little girl when her great-grandparents went to sleep.

Related: Tennant Murder Suspect Was a "Trusted Family Friend"

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