Julio was one of the informants who tell Burro of some buses being used to smuggle people across the border, with Burro having the protagonist destroy them for bussiness reasons. The protagonist later takes some money to Julio, Manolito, Paulo and Ricardo as payment for the information.
Julio is the first one to be paid-off and is encountered in east Marina. His dialogue when receiving the money suggest he's gonna spend it all on bars and/or nightclubs. He drives a purple Vulture.