--- category: Historical Phenomenon created: 2025-08-05 date: 1983-03-05 location: Route 132, Mariposa County, California relations: null summary: Collision on Route 132 in Mariposa County on March 5, 1983, between a sheriff's patrol car and a Secret Service convoy assigned to Queen Elizabeth's Yosemite visit, killing three agents. tags: - Event - California - Mariposa - CoverUp - 1983 updated: 2026-09-23 --- On March 5, 1983, a Mariposa County sheriff's patrol car driven by Sgt. [Roderick Sinclair](/people/roderick-sinclair/), with Deputy [Rod McKean](/people/rod-mckean/), collided on a winding stretch of Route 132 with the middle car of a three-car convoy of off-duty Secret Service agents in California to protect Queen Elizabeth II on her visit to Yosemite National Park. Agents [George P. LaBarge](/people/george-p-labarge/), [Donald W. Robinson](/people/donald-robinson/) and [Donald A. Bejcek](/people/donald-a-bejcek/) were killed; they were not wearing seat belts. Sinclair and McKean were injured. The convoy was preceding the royal motorcade, which passed the site a short time later; the Queen and Prince Philip detoured around it and saw the wreckage.[^1][^2] President [Ronald Reagan](/people/ronald-reagan/) issued a statement on the deaths.[^3] ### The Investigations A 178-page report of the Central Division of the [California Highway Patrol](/organizations/california-highway-patrol/), issued March 29, 1983, blamed Sinclair's speed, estimated at 76 to 80 miles an hour and later revised to 72, and recommended that he be prosecuted. The Mariposa County District Attorney, J. [Bruce Eckerson](/people/bruce-eckerson/), resisted CHP pressure to file charges for six months and engaged a retired CHP lieutenant, Bob Kovach, whose review disputed the skid-mark evidence; Sinclair's lawyer, David Linn, said the CHP had reached "a predetermined conclusion." The CHP stood by its report.[^2] The survivors of the three agents sued Mariposa County and Sinclair and settled for a total of 4 million dollars. The county then sued the [United States](/places/united-states/) for contribution, arguing that the federal drivers, Agent LaBarge and Agent Max Phillips in the car ahead, had driven negligently. The district court found that the collision occurred on a blind curve, that Sinclair was driving at 64 miles an hour in a 35-mile zone, 6 miles an hour below the critical speed for the curve, that both federal cars were halfway across the center line into his lane, and that their presence caused him to brake and skid; it found Sinclair 70 percent at fault and ordered the United States to pay 30 percent of the settlement, 1.2 million dollars. On August 26, 1986, the Ninth Circuit reversed, holding that the United States, as an employer covered by workers' compensation, could not be sued for contribution.[^1] ### Drug and Cover-up Allegations The writer [Cheri Seymour](/people/cheri-seymour/) wrote that Sinclair had been receiving large daily doses of Demerol prescribed by [Dr. Arthur Dahlem](/people/dr-arthur-dahlem/), as nurses at Fremont Hospital and former deputies confirmed; that Assistant U.S. Attorney [James White](/people/james-white/) in Fresno ordered Dahlem's files seized and Judge [Robert E. Coyle](/people/robert-e-coyle/) ordered him to drop the criminal investigation on the ground that no blood tests had been taken, although tests had been taken and later disappeared; that the CHP report went to the office of Attorney General [John Van de Kamp](/people/john-van-de-kamp/), who told an assistant to "discard" it; that Eckerson held stock in [MCA](/organizations/music-corporation-of-america/); and that the CHP officers on the original investigation and White himself resigned or were transferred or fired. Deputy [Rod Cusic](/people/rod-cusic/) told the Fresno office of the [FBI](/organizations/federal-bureau-of-investigation/) that Sinclair had told him "to lie to a Grand Jury," and said he had seen a booby-trapped incendiary device explode at Sinclair's home; Seymour wrote that a 1984 civil trial heard that Sinclair's car carried automatic weapons and a booby-trapped bomb. Sinclair was later promoted to commander. A Secret Service agent, [Ron Williams](/people/ron-williams/), whose friend was killed, and a CBS executive asked Seymour to investigate, and [Don Thrasher](/people/don-thrasher/) of ABC's *20/20* examined Sinclair's background. The case figured in the reporting of [Jerry Goldberg](/people/jerry-goldberg/) for *Capitol News Service* and the work of [D.I.G.](/organizations/dig-decency-in-government/)[^4] [^1]: *LaBarge v. County of Mariposa,* 798 F.2d 364 (9th Cir. 1986). The caption spells the sergeant's name Roderic B. Sinclair; the opinion, Roderick. [^2]: "Highway Patrol's Crash investigation questioned." United Press International, September 25, 1983. https://www.upi.com/Archives/1983/09/25/Highway-Patrols-Crash-investigation-questioned/7300433310400/ [^3]: Reagan, Ronald. "Statement on the Death of Three Secret Service Agents in California," March 5, 1983. Ronald Reagan Presidential Library. https://www.reaganlibrary.gov/archives/speech/statement-death-three-secret-service-agents-california [^4]: Seymour, Cheri. *The Last Circle: Danny Casolaro's Investigation into the Octopus and the PROMIS Software Scandal.* TrineDay, 2010. It describes Judge Coyle as ordering Mariposa County to pay 70 percent of the claim and Eckerson as appointed to write a replacement report; the court record places the 70 percent finding in the county's contribution suit against the United States, which was reversed, and contemporaneous reporting shows Eckerson as the elected district attorney resisting the CHP's call for prosecution. Sole source for the passages so cited.