The last time she spoke to her son was in a FaceTime cooking lesson. The next day she was the victim of a deadly scam

By Faith Karimi, CNN (CNN) — Mario Hall last saw his mother on the other end of a FaceTime call, teaching him how to make pepper steak. She’d propped her phone near the stove in her kitchen in Dublin, Ohio, so he could see the pan. From his home in Columbia, South Carolina, he watched