Stamford, Connecticut, police have arrested a Stamford High School English teacher who is accused of having a sexual relationship with an 18-year-old student and then threatening to fail him when he tried to break off the relationship. The teacher, Danielle Watkins, 32, of Norwalk, is on administrative leave, according to the high school. Police said she is a married mother of two. On June, 23, the Stamford Police Department Special Investigations Unit learned that Watkins might have been involved in an inappropriate relationship with one of her students and started investigating. Three days later, the student went to the police department and told authorities that he’d had several sexual encounters with his English teacher from September 2013 until June 2014. They took place in her car during school hours, but off school grounds, according to police.