Campbellsville Police say a 20-year-old man has admitted to the beating death of his great-grandmother.

"Grandmas are supposed to be old and sweet and precious and loving and you're not supposed to kill your grandma," says Sarah Young.

But that's exactly what police say happened. They say Jessie James Durham beat his great-grandmother, 78-year-old Elizabeth Armismier to death with a hammer. Jim Judd lives down the street from that house and says he just can't understand it.

"You couldn't ask for anybody nicer. Just as nice as you could be and just a sweet person. How would you do something like that, especially to a family member? It's just a terrible thing," he says.

Campbellsville Police were called to the Armismier's house Saturday morning after family members hadn't heard from her. They say they found her battered body inside her house and began interviewing relatives. After they picked up Durham on an outstanding warrant, they say he told them he'd gotten into an argument with her, then beat her to death with a hammer inside the house.

People who live along Daisy Drive say the brutal murder has forever changed the way they think about their community.

"You're going to be reminded of it daily. You're not going to feel as safe in your home as you did before. We used to not worry too much about locking our doors. That's going to change," says Judd.

Police said they couldn't speculate on a motive. Durham is being held at the Taylor County Detention Center on a $500,000 bond.