Lynn-Marie Brisson Viana, 53, was killed on April 4, 2021, in Derry, New Hampshire. An autopsy found a single gunshot wound to the head and the death was ruled a homicide. She had gone to the Mt. Pleasant Street home of her estranged husband, Manoel Viana, for a custody exchange involving their adult child; he invited her inside. Neighbors reported hearing two noises like gunshots and soon after the residence was on fire. Ignitable liquids were found in the home and on or around Lynn-Marie’s body.

Manoel Viana, 57, was critically injured with severe burns and apparent head trauma and was taken to a Boston hospital. Investigators said they planned to charge him with first-degree murder if he recovered. Three Derry police officers were injured while rescuing Manoel from the burning house, and responders could not recover Lynn-Marie’s body until the fire was out. Authorities said there was no indication of an ongoing threat and asked neighbors for surveillance footage.

Anyone who knew Lynn-Marie, saw activity on Mt. Pleasant Street that day, or has video that could help the investigation is asked to come forward.