|Agency||Chicago Fire Department|
|Type of Firefighter||Career|
|Age Range||51 to 55|
|Date of Birth||0/0/0|
|Date of Death||4/18/1949|
|Cause of Death||Stress/Overexertion|
|Nature of Death||Heart attack|
|Attribute of Death||[not applicable]|
|Type of Duty||Firehouse duties|
On April 18, 1949, Chicago Fire Department Engineer John Marek suffered a fatal heart attack while on duty at the Engine 116 firehouse.
“Fire Department Engineer Dies of Heart Attack,” Chicago Daily Tribune, April 19, 1949.