A north New Jersey high school music and theater teacher has been accused of sexually assaulting a teenage student over a prolonged stretch of time.

Pequannock High School teacher William Arnold, 53, faces charges including first-degree aggravated sexual assault following an investigation launched last month by the Pequannock Police Department and the Morris County Prosecutor’s Office after allegations of “inappropriate behavior” were reported by a fellow educator.

Pequannock High School teacher William Arnold, 53, was arrested last week for the student assault allegations. William Arnold /Facebook

Arnold — who is a married dad of three, according to his social media profiles — sexually assaulted the female student on “multiple occasions” over the last year, according to the Morris Cou

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