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CHICKAMAUGA, Ga. (AP) - The last walk that Ronald Westbrook took started around 1 a.m.

He slipped unnoticed from his North Georgia home with his two dogs. It ended three hours later when the 72-year-old Westbrook, who suffered from Alzheimer's disease, knocked on a stranger's door.

Police say a man inside that home, 34-year-old Joe Hendrix, got a .40-caliber handgun, went outside to investigate and shot Westbrook in a horrible mistake.

It was an unlikely collision between two strangers, one of them deeply confused and another who perceived a threat in the dark.

It shows the difficulties that caregivers face in keeping loved ones with Alzheimer's safe and the consequences of miscalculation in a state that celebrates its gun culture.