Colombian conflict dialogue, but President Barco sent an ultimatum to the guerrillas and demanded that they immediately disarm or face military retaliation. Regional guerrilla and Army skirmishes created a situation where each violation of the ceasefire rendered it null in each location, until it was rendered practically nonexistent. By 1990, at least 2,500 members of the FARC-founded Patriotic Union had been murdered, according to historian Daniel Pecáut, leading up to that year's assassination of presidential candidate Bernardo Jaramillo Ossa. The Colombian government initially blamed drug lord Pablo Escobar for the murder but journalist Steven Dudley argues that many in the UP pointed
Pablo Escobar radiotelephone transmissions and found him hiding in Los Olivos, a middle-class barrio in Medellín. With authorities closing in, a firefight with Escobar and his bodyguard, Álvaro de Jesús Agudelo ("alias" "El Limón"), ensued. The two fugitives attempted to escape by running across the roofs of adjoining houses to reach a back street, but both were shot and killed by Colombian National Police. Escobar suffered gunshots to the leg and torso, and a fatal gunshot through the ear. It has never been proven who actually fired the final shot into his ear, or determined whether this shot was made during the