| Name | Robert DeMars |
| Agency | Mattoon Fire Department |
| Rank | Firefighter |
| Type of Firefighter | [Unknown] |
| Age Range | [Unknown] |
| Sex | Male |
| Date of Birth | 0/0/0 |
| Date of Death | 3/29/1966 |
| Cause of Death | Vehicle collision |
| Nature of Death | Trauma |
| Attribute of Death | [not applicable] |
| Type of Duty | Responding to/returning from incident |
| Incident Name | N/A |
| Incident City | Mattoon |
| Incident State | IL |
| Incident Date | 3/29/1966 10:0 |
| Incident Location | Street/Road |
| Incident Attribute | Traffic accidents |
On March 29, 1966, Firefighter Robert DeMars of the Mattoon Fire Department died in the line of duty when two fire engines collided while responding to a fire. DeMars was fatally injured, and several other firefighters were hurt, and the collision left the city without any frontline apparatus for several weeks.