TRENTON, S.C. (AP) — A 60-year-old man who strangled his girlfriend died of a heart attack while burying her body in their South Carolina backyard, investigators said.

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Deputies found Joseph Anthony McKinnon’s body Saturday after neighbors called and reported an unconscious man in a yard in Trenton, the Edgefield County Sheriff’s Office said in a statement.

As they investigated McKinnon’s death, deputies found a body wrapped in trash bags in a freshly dug hole and determined it was his girlfriend, Patricia Ruth Dent, 65, investigators said.

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An autopsy on Dent determined she had been strangled and neighbors told officers they saw McKinnon digging a hole in his yard the day before, deputies said.

An autopsy on McKinnon determined he died of a heart attack. Deputies said it appeared he was nearly done filling the grave when he set the shovel down, walked away and collapsed.