The mother of a Las Vegas police officer killed in the Route 91 shooting died this weekend after falling while riding an escalator. Sheryl Stiles was in town to attend the Friday services for her only son, Charleston Hartfield, the Metropolitan Police Department officer killed in the Oct. 1 shooting. Cecil Ralston, Sheryl’s cousin, said she fell while riding an escalator at a Las Vegas hotel. “No one expected anything like this to happen,” Ralston said.