| Name | John Callahan |
| Agency | Chicago Fire Department |
| Rank | Engineer |
| Type of Firefighter | Career |
| Age Range | 51 to 55 |
| Sex | Male |
| Date of Birth | 0/0/0 |
| Date of Death | 6/27/1963 |
| Cause of Death | Stress/Overexertion |
| Nature of Death | Heart attack |
| Attribute of Death | [not applicable] |
| Type of Duty | [Unknown] |
| Incident Name | N/A |
| Incident City | Chicago |
| Incident State | IL |
| Incident Date | 6/27/1963 |
| Incident Location | Firehouse |
| Incident Attribute | [Not applicable] |
On June 27, 1963, John Callahan, an engineer at the Chicago Fire Department maintenance plant, suffered a heart attack while on duty. Callahan was taken to St. Ann’s Hospital where he passed away.
Citation:
Obituary of John Callahan, Chicago Daily Tribune, June 29, 1963.