The case set off a complex international investigation that concluded with the conviction of several key suspects but did not touch the most senior level of Chile’s U.S.-backed government.

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The CIA assessment released Friday is part of a suite of documents presented in 1987 to President Ronald Reagan by his national security adviser, Frank Carlucci, regarding U.S. government policy on Chile.

In the document, the CIA states that “a review of our files on the Letelier assassination has provided what we regard as convincing evidence that President Pinochet personally ordered his intelligence chief to carry out the murder.”

Peter Kornbluh, who directs the Chile Documentation Project at George Washington University’s National Security Archive, said the newly released documents support the CIA’s conclusion by showing the attempts by Pinochet’s former intelligence chief to blackmail Pinochet over the case, and by highlighting the lengths to which Pinochet went to stymie efforts to bring those responsible to justice.

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“We’re talking micromanaging a coverup of an act of terrorism in Washington, D.C. to save his own skin,” Kornbluh said.

The State Department said the release concludes the Obama administration’s initiative to make public information and internal information about the events surrounding Letelier’s murder.

Speaking at a memorial event on Sheridan Circle on Friday, Chilean President Michelle Bachelet thanked the Obama administration for providing the previously classified information about the case. Bachelet, who along with her mother was tortured by the Chilean government after the U.S.-backed coup of 1973, said that it was “sobering to be here after four decades since evil and horror came to this place to cut short the lives” of Letelier and Moffitt.

CHILÉ REMEMBERS PINOCHET VICTIMS IN D.C. A memorial is happening at Washington's Sheridan Circle, marking the 40th anniversary of the assassination of Chilean dissident Orlando Letelier and colleague Ronni Moffitt at this spot. The president of Chile, Michelle Bachelet, will make remarks. Posted by Washington Post Local on Friday, September 23, 2016

“If Orlando Letelier was a symbol of struggle during his life, his image has become a symbol of the search for truth, reparation and justice,” Bachelet said.

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Letelier’s son Juan Pablo, who is a member of the Chilean Senate, said the new documents would assist in the pursuit of justice for the death of Moffitt, a U.S. citizen.

In 1993, two Chilean officials, including the former intelligence chief, were convicted in Letelier’s death. When Pinochet died in 2006, after being stripped of his immunity, he left behind unresolved court cases related to alleged crimes committed under his leadership.

“The declassified documents are providing a verdict of history where a legal verdict is no longer possible,” Kornbluh said. Additional documents can be found on the National Security Archive website.

Karen DeYoung contributed to this report from New York. Thomas Gibbons-Neff contributed from Washington.