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Ronald Ridenhour
My Lai Massacre Whistleblower
Specialist 5, 11th Light Infantry Brigade, Americal Division
Overview
Ronald Ridenhour was the American soldier who exposed the My Lai massacre to the world. Although not present during the massacre itself, Ridenhour served in the same brigade and heard detailed accounts of the atrocity from multiple soldiers who had participated. Horrified by what he learned, Ridenhour spent months carefully documenting the accounts and cross-referencing testimonies before composing a meticulously detailed letter that he sent to 30 members of Congress, the Secretary of Defense, the Secretary of the Army, the Chairman of the Joint Chiefs of Staff, and other officials on March 29, 1969, exactly one year after the massacre. His letter, which named names, cited specific incidents, and provided a coherent narrative of the massacre, triggered the Army investigation that eventually led to the Peers Commission and the court-martial of Lieutenant William Calley. Without Ridenhour's moral courage in sending that letter, the My Lai massacre might have remained buried forever under the military's cover-up. After the war, Ridenhour became an investigative journalist, continuing to expose government wrongdoing until his death in 1998 at age 52. The Ridenhour Prizes for truth-telling and courage are named in his honor.
Key Affiliations
Controversies & Concerns
The Letter That Exposed My Lai: On March 29, 1969, Ridenhour sent a carefully documented letter to 30 members of Congress, the Secretary of Defense, the Secretary of the Army, and other officials describing the My Lai massacre in detail. The letter named specific soldiers, described specific killings, and provided a coherent narrative that made the atrocity impossible to ignore. This letter directly triggered the Army's criminal investigation.
Systematic Documentation of Testimony: Before sending his letter, Ridenhour spent months tracking down and interviewing soldiers who had been at My Lai. He cross-referenced multiple accounts to ensure accuracy, gathering testimony from participants including Michael Bernhardt and others who confirmed the massacre. His methodical approach produced documentation that the Army could not dismiss.
Courage to Break Military Code of Silence: By exposing the massacre, Ridenhour violated the unwritten code of military loyalty that required soldiers to protect fellow service members. He faced significant social ostracism and criticism from those who viewed him as a traitor, yet he persisted because he believed the massacre had to be acknowledged.
Post-War Investigative Journalism Career: After leaving the Army, Ridenhour became an investigative journalist, working for newspapers in the New Orleans area. He continued exposing government corruption and wrongdoing, including investigating corruption in the New Orleans Police Department and political scandals in Louisiana.
Testimony to Congress and the Peers Commission: After sending his letter, Ridenhour provided extensive testimony to Congressional committees and the Peers Commission investigating the massacre. His detailed, credible testimony was instrumental in establishing the scope of the atrocity and the extent of the cover-up.
The Ridenhour Prizes Legacy: After Ridenhour's death in 1998, the Ridenhour Prizes were established to honor individuals who demonstrate truth-telling and moral courage in the tradition of Ridenhour's My Lai exposure. Recipients have included whistleblowers, journalists, and activists who exposed wrongdoing at personal risk.
Related Investigations (1)
Known Associates & Connections
Seymour Hersh
Journalist who publicized the massacre story after Ridenhour's letter triggered the Army investigation
Hugh Thompson Jr.
Helicopter pilot who tried to stop the massacre, corroborated by Ridenhour's investigation
William Calley
Platoon leader named in Ridenhour's letter as primary perpetrator
William Peers
Lieutenant General who led the investigation Ridenhour's letter triggered
Sources & Documentation
5 documented sources from official records, investigations, and reports
National Archives - My Lai Massacre Records
PBS American Experience - My Lai
Ridenhour Foundation - ridenhour.org
Seymour Hersh - My Lai 4: A Report on the Massacre and Its Aftermath (1970)
Michael Bilton and Kevin Sim - Four Hours in My Lai (1992)
Personal Information
- Born
- April 6, 1946
- Birthplace
- Phoenix, Arizona
Education
- •Claremont Graduate University
- •Phoenix College
Key Timeline
April 6, 1946
Born in Phoenix, Arizona
1967
Deployed to Vietnam with the 11th Light Infantry Brigade, Americal Division
March 16, 1968
My Lai massacre occurs; Ridenhour was not present but begins hearing accounts from participants
1968-1969
Spent months documenting testimony from multiple My Lai participants
March 29, 1969
Sent detailed letter to 30 Congress members and military officials exposing the My Lai massacre
April 1969
Army launches criminal investigation based on Ridenhour's letter
1969-1970
Testified before Congress and the Peers Commission
1970s
Became investigative journalist in New Orleans, continuing to expose government wrongdoing
May 10, 1998
Died of heart attack at age 52 in New Orleans, Louisiana
2004
Ridenhour Prizes established in his honor to recognize truth-telling and moral courage