| Name | John Kaisrlik |
| Agency | Chicago Fire Department |
| Rank | Firefighter |
| Type of Firefighter | Career |
| Age Range | [Unknown] |
| Sex | Male |
| Date of Birth | 0/0/0 |
| Date of Death | 7/31/1951 |
| Cause of Death | Stress/Overexertion |
| Nature of Death | Heart attack |
| Attribute of Death | [not applicable] |
| Type of Duty | Post-incident |
| Incident Name | N/A |
| Incident City | Chicago |
| Incident State | IL |
| Incident Date | 7/31/1951 |
| Incident Location | Firehouse |
| Incident Attribute | [Not applicable] |
On July 31, 1951, Chicago Fire Department Firefighter John Kaisrlik died in the line of duty after suffering a heart attack in company quarters after fighting a fire at 455 N. Lincoln.