His body was found just 48 hours later in the small town of Quimili, in the northern Argentine province of Santiago del Estero.
Three men and a school headmistress have now been charged with the horrific killing, following the arrest of three other men last June.
A postmortem conducted last year concluded that Marito was raped before being hung with a wire. He was then dismembered as he died.
crime scenePolice confirmed that they have just arrested Miguel Angel Jimenez, 58; his wife, a school director called Arminda Lucrecia Dia, 57; their son, Alfredo Daniel Albarracin, 40; and Pablo Ramirez, 38.
All of the new detainees are from the same family. The three men detained last June were named as Rodolfo Sequeira, David Tomas Sosa, and Ramon Salvatierra.
Judge Rosa Falco de Rainieri, who is presiding over the case, said it is believed that the boy was killed as part of a Satanic ritual.
Police have said there could be more arrests as the investigation continues.
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