WATERTOWN â The city will conduct its own investigation into what caused the death of city firefighter Peyton Lane S. Morse following an incident at the stateâs fire academy in early March. The city has retained a private investigative firm, AMRIC Associates Ltd., Syracuse, to conduct the investigation into what happened when the young firefighter became unresponsive while training at the New York State Academy of Fire Science on March 3. Nine days later, Mr. Morse died at a Pennsylvania hospital. A Pennsylvania coroner has not yet determined the cause and manner of his death. âWe want to find out what happened and what caused it,â City Manager Kenneth A. Mix said Wednesday.