Terrified residents canceled Fourth of July plans and holed up in their homes Friday as investigators hunted a serial killer believed to have shot four people to death. Tanya Phillips had been looking forward to a backyard barbecue at her brother's house but instead planned to stay home with her doors locked. "I'm not taking any chances," said Phillips, 32, a mother of two who works in a day-care center. "I'll go out during the day, but not at night. I just don't feel safe." Plenty of evidence links the killings, though officials have not yet determined how the victims are connected or if they knew whoever shot them, said Cherokee County Sheriff Bill Blanton. "Yes, we have a serial killer," he said at a news conference in this rural...