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Mark Gregory Diebold
Incident
Deputy Constable Mark Diebold suffered a fatal heart attack following qualifications for the agency's tactical team.
Members of the tactical team immediately began CPR when he collapsed following the qualifications. He was transported to Alliance Medical Center where he was pronounced dead.
Deputy Diebold had served with the Tarrant County Constable's Office - Precinct 5 for nine years and had previously served with the Tarrant County Sheriff's Office for 14 years.
Survivors
He is survived by his wife and three children.
In Our Keeping
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- Maintained by NeuraWeb Global Inc.
- Added to badge.nw
- August 2, 2026
- Last updated
- August 2, 2026
Honored here by 1 tribute.
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Tributes
23 years. You could have gone home.
Deputy Constable Diebold gave the Tarrant County Constable's Office 23 years. Still answering calls at the end.
Thank you for your service to the Fort Worth community. Gone but never to be forgotten.
Rest easy, Deputy Constable Diebold.
— S. Vincent Anthony, U.S. Army 1985-1993
Agency
Service Record
Incident Details
The Sacrifice · Cardiac
Tarrant County Constable's Office - Precinct 5 has lost 2 officers; 1 of them lost to cardiac events.
Mark is one of 88 officers lost to cardiac events in TX, 3.6% of the 2,422 remembered there.
Mark is one of 1,307 officers lost to cardiac events in the United States, 4.7% of the 27,551 remembered there.
Mark is one of 1,309 officers lost to cardiac events worldwide, 3.9% of the 33,917 remembered here.
33,917 officers are remembered on this memorial. Each number below is one of them.
Time
In 2017, 2 officers in TX were lost to cardiac events, the 10th heaviest of 53 years on record. The heaviest was 1978, with 4.
In 2017, 22 officers in the United States were lost to cardiac events, the 3rd heaviest of 139 years on record. The heaviest was 2014, with 24.
In 2017, 22 officers worldwide were lost to cardiac events, the 3rd heaviest of 139 years on record. The heaviest was 2014, with 24.
Who
Mark was 48. Of the 84 lost to cardiac events in TX whose age is recorded, half were between 42.8 and 57; the middle age was 50. Mark had served 23 years; the middle length of service was 15 years.
Mark was 48. Of the 1,249 lost to cardiac events in the United States whose age is recorded, half were between 43 and 55; the middle age was 48. Mark had served 23 years; the middle length of service was 15 years.
Mark was 48. Of the 1,251 lost to cardiac events worldwide whose age is recorded, half were between 42.5 and 55; the middle age was 48. Mark had served 23 years; the middle length of service was 15 years.
When
September holds 12.5% of these deaths in TX; October holds the most, 12.5%. Thursdays: 21.6%.
September holds 8.3% of these deaths in the United States; January holds the most, 9.6%. Thursdays: 14.5%.
September holds 8.3% of these deaths worldwide; January holds the most, 9.5%. Thursdays: 14.5%.
How
Cardiac deaths account for 50% of all 2 deaths at Tarrant County Constable's Office - Precinct 5, the most common cause.
Cardiac deaths account for 3.6% of all 2,422 deaths in TX, the 4th most common cause.
Cardiac deaths account for 4.7% of all 27,551 deaths in the United States, the 4th most common cause.
Cardiac deaths account for 3.9% of all 33,917 deaths worldwide, the 4th most common cause.
His people
Tarrant County Constable's Office - Precinct 5 has 2 officers remembered here, Mark among them.
Where the Name Is Cut
National Law Enforcement Officers Memorial · Panel 59-E
What is kept
Photographs, film, sound and papers — what survived a life.
Others Who Wore This Badge
1 officer from Tarrant County Constable's Office - Precinct 5 are honored on badge.nw.