Velasco was a high ranked member of the Medellín Cartel.
He´s first seen with Pablo Escobar as one of his men working in La Catedral. He´s one of his most trusted men and the one who commands the rest. He manages to escape the Colombian Army assault.
Later, he´s allmost all time very next to Pablo, whereever he is, passing him all the information about the situation in Medellin.
He´s finally captured thanks to the information given by Maritza to Peña. His captors are the Pepes, a combined force of the paramilitary and members of the Medellin Cartel loyal to Judy Moncada. He´s interrogated and tortured by Don Berna, who gets some information from Velasco. Some days after, his dead body is found in Medellin, with a open letter signed by los Pepes.