A high school English teacher was arrested Thursday morning and charged with sexual assault for allegedly maintaining an inappropriate relationship with a student, police said. Danielle Watkins, 32, of Norwalk, turned herself in to police Thursday morning, police said. She was charged with two counts of second-degree sexual assault, two counts of sale of marijuana and one count of risk of injury to a minor. According to police, Watkins maintained a sexual relationship with an 18-year-old student from September 2013 until June 2014. The victim allegedly told police that the two had numerous sexual encounters in her vehicle during school hours. He said the car was parked off of school grounds. Watkins also allegedly sent pictures of herself, naked, to the student's phone, police said. The victim said that at one point he attempted to break off the relationship, but Watkins assaulted him and accused him of being with someone else, police said.