Charges have been filed against a New York Mills teacher accused of having a sexual relationship with a female student. Prosecutors say Kris Koll began exchanging text messages with the victim in October, which led to a number of sexual encounters. The victim told investigators she was hired to babysit for Koll’s family last year and was one of his students. Koll is on administrative leave. If convicted, he faces up to 10 years in prison.