[2][failed verification – see discussion] Once in Paraguay, Martínez allegedly began working as a thief and hitman for organized crime groups, and was arrested several times in his home country and in Argentina.
During these arrests, he claimed his real name was Yamel Yamil Oskiski (or Fresmann), and that he had served as a mercenary for the IDF during the Gulf War.
Martínez committed his first known murder on 31 May 1993, when he shot and killed ranch foreman Pascual Pedro Bianco in Santa Fe, Argentina over a land dispute.
[1] On 11 April 1995, he shot and burned the body of cattle rancher Ignacio Antonio Vargas, known as 'Nene', who owned the Ypoa Ranch in Quiindy.
While in prison, he claimed that he had pertinent information relating to the AMIA bombing and was extradited to Argentina in 2001 in order to testify and serve his sentence for the 1993 murder.
[1] On 23 May 2009, 50-year-old former councilman and cattle rancher Ricardo Cecilio Cabello Cazal, along with his farmhands Hilario Marecos and Alberto Medina Blanco, were murdered, their bodies dismembered and subsequently burned in an oven in Ybycuí.
[6] He was held awaiting trial for the triple murder until 2015, when he was released thanks to a habeas corpus given for a judicial delay, because he had not been given a firm sentence during that time.
[2] On 22 May 2018, 54-year-old lawyer Lucilo Nicolás Cardozo Salina received a call from Martínez, an acquaintance of his, telling him that he needed him for a court case in Encarnación.
According to his claims, an alleged drug trafficker named Lucio Santiago Godoy Quiñónez promised him $10,000 if he delivered the lawyer to him, which he accepted.