St. JOHNSBURY, Vt. (AP) — Charges were upgraded Friday against a Vermont couple accused of killing a prep school teacher and dumping her body in the Connecticut River, after authorities said the couple planned the crime in advance and the wife later bragged about it to fellow jail inmates.

Allen Prue, 30, and Patricia Prue, 33, of Waterford, previously pleaded not guilty to second-degree murder in the March death of Melissa Jenkins of St. Johnsbury. Caledonia County State’s Attorney Lisa Warren amended the charges Friday against both; Allen Prue was charged with first-degree murder, while Patricia Prue was charged with aggravated murder.