Incident
Deputy Sheriff Mark Tonkin was killed in a helicopter accident while working on a multi-agency narcotics task force along the United States border. A suspicious vehicle was spotted in a canyon on a remote access road in the Mountain Springs Grade area. The UH-1H helicopter began to descend when its rotor blades struck power lines and caused it to crash in the foothills of the Laguna Mountains. Also killed in the accident were Investigator Michael Davis of the Riverside County Sheriff's Department, Deputy Roy Chester of the Los Angeles County Sheriff's Department, Sergeant Richard Romero of the Imperial County Sheriff's Department, Deputy Mark Tonkin of the Orange County Sheriff's Department, and the three California National Guard crew members operating the flight. Deputy Tonkin had served with the Orange County Sheriff's Department for seven years.
Survivors
survivors guilt after 37 years.
In Our Keeping
- Permanent identifier
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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
I never knew you. I am standing here anyway.
Deputy Sheriff Tonkin gave the Orange County Sheriff's Department 7 years.
Thank you for your service to the Santa Ana community. Gone but never to be forgotten.
Rest easy, Deputy Sheriff Tonkin.
— S. Vincent Anthony, U.S. Army 1985-1993
Agency
Service Record
Incident Details
The Sacrifice · Accident
Orange County Sheriff's Department has lost 10 officers; 4 of them lost to accidents.
Mark is one of 720 officers lost to accidents in CA, 39.2% of the 1,839 remembered there.
Mark is one of 8,275 officers lost to accidents in the United States, 30% of the 27,551 remembered there.
Mark is one of 10,100 officers lost to accidents worldwide, 29.8% of the 33,917 remembered here.
33,917 officers are remembered on this memorial. Each number below is one of them.
Time
In 1988, 14 officers in CA were lost to accidents, more than in any other year.
In 1988, 80 officers in the United States were lost to accidents, the 27th heaviest of 174 years on record. The heaviest was 1929, with 118.
In 1988, 84 officers worldwide were lost to accidents, the 48th heaviest of 200 years on record. The heaviest was 1930, with 131.
Who
Mark was 31. Of the 690 lost to accidents in CA whose age is recorded, half were between 30 and 42.8; the middle age was 35. Mark had served 7 years; the middle length of service was 7 years.
Mark was 31. Of the 7,718 lost to accidents in the United States whose age is recorded, half were between 29 and 46; the middle age was 36. Mark had served 7 years; the middle length of service was 6 years.
Mark was 31. Of the 9,451 lost to accidents worldwide whose age is recorded, half were between 29 and 45; the middle age was 36. Mark had served 7 years; the middle length of service was 6 years.
When
October holds 8.6% of these deaths in CA; August holds the most, 9.4%. Mondays: 14.6%.
October holds 9.1% of these deaths in the United States; August holds the most, 9.5%. Mondays: 13.4%.
October holds 9.2% of these deaths worldwide; August holds the most, 9.3%. Mondays: 13.5%.
How
Accident deaths account for 40% of all 10 deaths at Orange County Sheriff's Department, the 2nd most common cause.
Accident deaths account for 39.2% of all 1,839 deaths in CA, the 2nd most common cause.
Accident deaths account for 30% of all 27,551 deaths in the United States, the 2nd most common cause.
Accident deaths account for 29.8% of all 33,917 deaths worldwide, the 2nd most common cause.
His people
Orange County Sheriff's Department has 10 officers remembered here, Mark among them.
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Robert Squires
Dec 16, 1912
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Ezra Stanley
Nov 19, 1940
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Robert Shultz
Apr 21, 1958
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Mark Steven Tonkin
Oct 24, 1988
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Darryn Leroy Robins
Dec 25, 1993
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Bradley Jay Riches
Jun 12, 1999
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Steven Edward Parsons
Jun 24, 2000
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Matthew Ray Davis
Sep 22, 2002
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Ira Gabor Essoe, Sr.
Feb 4, 2010
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Carlos J. Cammon
Aug 23, 2019
Where
Where the Name Is Cut
National Law Enforcement Officers Memorial · Panel 47-E
What is kept
Photographs, film, sound and papers — what survived a life.
Others Who Wore This Badge
9 officers from Orange County Sheriff's Department are honored on badge.nw.








