Firefighter Convicted of Murdering Pregnant Partner in Illinois

On November 25, 2020—the day before Thanksgiving—firefighters responding to a residential blaze in Mt. Morris, Illinois discovered the body of Melissa Lamesch, 27, inside the home. The pregnant woman, nine months along and expecting her first child, had become victim to what investigators would determine was not an accidental fire, but a calculated murder staged to look like one.

Matthew Plote, 33, a firefighter and paramedic with years of professional training in fire investigation, had called 911 to report the fire. He would later be charged with the murder of his long-time girlfriend and the arson that followed.

**The Autopsy Turns the Case**

What makes this case exceptional in investigative terms is how forensic pathology became the cornerstone of the prosecution. Plote had reportedly relied on the fire itself to destroy evidence and obscure the cause of death—a common assumption among those who commit such crimes. But the autopsy revealed critical details that contradicted any accidental fire scenario.

Toxicologists found no soot in Lamesch's lungs and abnormally low carbon monoxide levels—markers that would be present in any victim who inhaled smoke or fumes during a fire. Instead, pathologists identified clear evidence of strangulation, indicating she had been dead before the flames were set. This finding shifted the investigation's trajectory entirely: from potential accident to deliberate murder.

Fire investigators then examined the house itself. They found no electrical faults that could have ignited the blaze. Critically, both the oven and stovetop burners were in the off position—eliminating common accidental ignition sources. Forensic analysis of the fire's origin and spread pattern led experts to classify it as deliberately set arson.