Police believe Michael Nolan shot and killed a police officer . Nolan himself is believed to have died in an ensuing struggle and explosion . The Brentwood , New Hampshire , Police Department was in mourning Tuesday , even as investigators tried to understand how one officer 's response to a domestic disturbance call ended this way . There is no criminal record for Nolan -- not even a motor vehicle record .
Police believe Michael Nolan shot and killed a police officer . Nolan himself is believed to have died in an ensuing struggle and explosion . There is no criminal record for Nolan -- not even a motor vehicle record .