Marcos Orlando Letelier del Solar (13 April 1932 – 21 September 1976) was a Chilean economist, politician and diplomat during the presidency of Salvador Allende. A refugee from the military dictatorship of General Augusto Pinochet, Letelier accepted several academic positions in Washington, D.C. following his exile from Chile. In 1976, agents of Dirección de Inteligencia Nacional (DINA), the Pinochet regime's secret police, assassinated Letelier in Washington via the use of a car bomb. These agents had been working in collaboration with members of the Coordination of United Revolutionary Organizations, a U.S.-sponsored anti-Castro militant group.