In June 1993, Justo Arizapana Vicente, a recycler, and his friend Guillermo Cataroca, leaked a marked map to congress man Roger Cáceres Velásquez and Radio Comas journalist Juan Jara Berrospi. Cáceres then shared the map with Ricardo Uceda at the news magazine "Sí", who published it in July of that year. Mariella Barreto, an agent of the Peruvian Army Intelligence Service, is also sometimes credited with leaking this map to a Peruvian magazine. An investigation of the site indicated on the map by the public prosecutor revealed four clandestine graves. Forensic tests conducted on the remains, and on another set of bones found at another site, revealed that they belonged to Muñoz Sánchez and the students Luis Enrique Ortiz Perea, Armando Amaro Condor, and Juan Gabriel Mariños Figueroa, and that at least some of them had been tortured prior to receiving an execution-style coup-de-grâce to the base of the neck. Barreto was murdered some years later: her decapitated and dismembered corpse, showing signs of ante-mortem torture, was found in March 1997. A few weeks after Mariella Barreto's death, her colleague Leonor La Rosa, was on TV in a hospital bed, declaring she had been tortured and that Barreto had been killed in retaliation for leaking information to the press about the Groupo Colina's plan to intimidate journalists and politicians from the opposition.