| Name | Martin Costello | 
| Agency | Chicago Fire Department | 
| Rank | Lieutenant | 
| Type of Firefighter | Career | 
| Age Range | [Unknown] | 
| Sex | Male | 
| Date of Birth | 0/0/0 | 
| Date of Death | 10/27/1971 | 
| Cause of Death | Stress/Overexertion | 
| Nature of Death | Heart attack | 
| Attribute of Death | [not applicable] | 
| Type of Duty | Firefighting operations | 
On October 27, 1971, Chicago Fire Department Lieutenant Martin Costello died in the line of duty after suffering a heart attack while performing firefighting operations at 420 N. Hoyne.