According to the Jacksonville Daily News, Master Gunnery Sgt. James J. Petrongelli, 46, of south suburban Chicago Heights collapsed as he finished physical training Thursday.
The Bloom High School graduated married his high school sweetheart and had five children who are between the ages of 10 and 24.
Petrongelli's nearly 30-year career with Marine Corps included several overseas deployments, most recently to Iraq.
His cause of death is still under investigation.