Corey Lewis first noticed the woman as he crossed the Walmart parking lot in Marietta, Ga., on Sunday afternoon. She was sitting in a Kia sedan, he said, as he led the two children he was babysitting back to his car. By the time he had them buckled up and ready to go, he had his phone out and was live-streaming on Facebook as he narrated a story about how the strange woman had begun stalking them after he refused to let her talk to the children, Mr Lewis, 27, said in an interview.