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Deputy Sheriff

Mark Allan Cox

Real County Sheriff's Office — Leakey, TX

Cardiac Veteran

End of Watch September 25, 2018

Age 57

Tour of Duty 8 yrs

The Vigil Panel 169 ›

Gender Male

Incident Service The Sacrifice

Incident

Deputy Sheriff Mark Cox suffered a fatal heart attack while conducting canine training on the 600 block of County Road 202 in Liberty Hill, Texas, at 10:00 am.

Deputy Cox was a U.S. Navy veteran and had served with the Real County Sheriff's Office for three years and had previously served with the Edwards County Sheriff's Office for five years. He had also previously served with a law enforcement agency in Florida.

Survivors

He is survived by his wife and two children.

In Our Keeping

Permanent identifier: BO-US-TX-4F940CC9
Stewardship: Maintained by NeuraWeb Global Inc.
Added to badge.nw: April 2, 2026
Last updated: July 23, 2026

Honored here by 1 sentinel - 1 tribute.

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Tributes

I served 1985 to 1993. You served too, before the badge - different uniform, same idea. You go where you are sent and you do not get to pick the call.
Deputy Sheriff Cox gave the Real County Sheriff's Office 8 years.
Thank you for your service to the Leakey community. Thank you for your service before it. Gone but never to be forgotten.
Rest easy, brother.

— S. Vincent Anthony, U.S. Army 1985-1993

Agency

Department Real County Sheriff's Office

Location Leakey, TX

Platform Identity rcso.real.tx.us.gov.nw

Service Record

End of Watch September 25, 2018

Tour of Duty 8 yrs

Age 57

Gender Male

Incident Details

Cause Cardiac

Military Service

Mark Allan Cox served in the United States military before joining law enforcement. Full service record available on salute.nw.

Deputy Sheriff Mark Allan Cox is one of 1,306 officers lost to cardiac events in the line of duty across the full record of this memorial — 4% of all 32,508 officers honored here.

In TX, 88 of 2,421 officers were lost to cardiac events in the line of duty — 3.6% of this state's fallen.

Real County Sheriff's Office

of 1 officers

100% Cardiac

TX — Statewide

of 2,421 officers

3.6% Cardiac

Nationwide

1,306

of 32,508 officers

4% Cardiac

National Cause Distribution

How Cardiac compares to all causes of officer death in the memorial record. Mark Allan Cox's cause is highlighted.

Felonious

17,623 (54.2%)

Accident

10,088 (31%)

Illness

2,974 (9.1%)

Cardiac

1,306 (4%)

Undetermined

260 (0.8%)

Suicide

256 (0.8%)

vehicular

1 (0%)

How Mark Allan Cox Compares

Age at End of Watch

This officer

Avg for Cardiac: 48.6 years

Years of Service