Jhon Jairo Velasquez, known by his nickname Popeye, was paroled in 2014 after confessing to hundreds of murders and spending 22 years in jail for plotting the murder of a former presidential candidate.
Since being released, Velasquez has gained notoriety as an author and YouTube celebrity who delivers angry diatribes against leftist rebels, corrupt politicians and Venezuela's socialist government.
His presence at a raucous birthday party for Juan Carlos Mesa, one of Colombia's most-wanted drug traffickers, constituted a "very serious" offense, said Colombia's chief prosecutor's office. The US had been offering a USD 2 million bounty for Mesa's capture.
It was unclear what Velasquez was doing at the party. El Tiempo newspaper reported that police seized more than USD 40,000 in cash, jewelry and seven luxury cars.
Velasquez took advantage of his time behind bars to obtain a number of academic degrees and to seek forgiveness from his victims. He also provided prosecutors with testimony that led to the conviction of a former justice minister close to Escobar.
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