An assistant principal at Lincoln Middle School in Berwyn was one of three people killed, including the suspected gunman, in what appeared to be a “domestic-related” shooting outside the school Tuesday, according to police and school officials.

Assistant Principal Nerissa Lee, 46, was identified as one of the victims in Tuesday’s shooting outside the west suburban campus at 6432 16th St., according to Berwyn North School District 98 Superintendent Michelle Smith and the Cook County medical examiner’s office.

An autopsy Wednesday determined Lee and a second unidentified woman died of multiple gunshot wounds in a homicide, according to the medical examiner’s office.

A third person who died in the shooting, Steven T. Lee, 54, died of a gunshot wound to the head in a suicide, the office s

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