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| Deputy Sheriff Mark Steven Tonkin Orange County Sheriff's Department California End of Watch: Monday, October 24, 1988 Biographical Info Age: Not available Tour of Duty: Not available Badge Number: Not available Incident Details Cause of Death: Aircraft accident Date of Incident: Monday, October 24, 1988 Weapon Used: Not available Suspect Info: Not available Deputy Tonkin was killed in a helicopter accident while working on a multi-agency narcotics task force. A car was spotted in a canyon and the helicopter began to descend when its rotor blades struck power lines and caused it to crash.
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, and Deputy James McSweeney of the Los Angeles County Sheriff's Department, and the three California National Guard crew members operating the flight. Related Line of Duty Deaths |  |