General Schneider's official car was ambushed at a street intersection in the capital city of Santiago, Chile.
When the general drew a gun to defend himself, he was shot point-blank several times.
Though he was rushed to a military hospital, General Schneider's wounds proved fatal and he died three days later, on October 25.
General Viaux was later convicted of involvement with the plot and imprisoned.
Critics of U.S.
policy in Chile at the time, including journalist Christopher Hitchens, have accused former U.S.
National Security Advisor and Secretary of State Henry Kissinger of conspiring with Viaux in the murder of General Schneider.
Yet declassified U.S.
documents show that the Central Intelligence Agency had explored the possibility of supporting a Viaux coup but decided that his ideology was "far out" and, while maintaining contact with him, did not provide direct support.
In a declassified October 15 conversation with President Richard Nixon, Kissinger said, "This looks hopeless.
I turned it off.
Nothing could be worse than an abortive coup."Although contact with the Viaux group was ended, a cable from CIA headquarters to the Santiago station reveals that the CIA did arrange the delivery of submachine guns and ammunition to a group led by General Valenzuela; Schneider was shot later that same day.
The weapons, along with $50,000, were later recovered by U.S.
Wilmert then drove to Vina del Mar, where he threw the submachine guns into the Pacific Ocean.In August, 1973, Viaux was released and exiled to Paraguay.
He was not involved in the successful Chilean coup of 1973, and was allowed to return to Chile only in 1990, by President Patricio Aylwin.
Viaux lived quietly in retirement in Santiago, until his death on September 5, 2005.