|Agency||Libertyville Fire Department|
|Type of Firefighter||Paid-On-Call (POC)|
|Date of Birth||0/0/0|
|Date of Death||10/12/1971|
|Cause of Death||Stress/Overexertion|
|Nature of Death||Heart attack|
|Attribute of Death||[not applicable]|
|Type of Duty||Post-incident|
On October 12, 1971, Assistant Chief William Foss of the Libertyville Fire Department suffered a fatal heart attack, his second heart attack while on duty with the Libertyville Fire Department. Foss had suffered his first heart attack during a training exercise a few years earlier, and doctors had cleared him to return to active duty.
Foss served with the Libertyville Fire Department as a volunteer firefighter from March 1948 to November 1950. He rejoined the department in September 1952 and remained a paid-on-call member until his death nineteen years later.