She also confessed to sending nude pictures through social media to a student, according to a warrant for her arrest. She worked as a substitute teacher at Fairmont High School in Kettering, Ohio, according to police records. Online court records do not indicate whether Marx has an attorney, and courts were closed for Veterans Day. On Wednesday, police detectives went to Fairmont High School to investigate a report of two minor students having sexual contact with a substitute teacher, according to the warrant. By early afternoon, the authorities had enough evidence to arrest Marx, police spokesman John Jung said. Marx was formally charged Thursday, he said. An 11th-grade student told detectives that Marx performed oral sex on him in July in a commercial parking lot.