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Investigators worked Monday to determine why a 45-year-old painter busted into a North Carolina nursing home on a horrific shooting rampage that left eight dead and several others injured. One possible clue: the gunman's estranged wife works at the 110-room Pine lake Health and Rehab, where authorities say Robert Stewart shot and killed seven residents — most in their late 80s — and a nurse who cared for them. "We're certainly looking into the fact that it may be domestic-related," said Carthage Police Chief Chris McKenzie. cKenzie said Monday he believed the couple were recently separated, but acknowledged he didn't yet know many more details about her. A neighbor said Stewart's estranged wife is a certified nurse assistant at the nursing home named Wanda Luck, and public records indicate she shared an address with Stewart in Carthage. Several telephone numbers for Luck or her family were dis