Brazilian actor Jefferson Machado's body discovered 6 feet underground

Brazilian soap opera actor Jefferson Machado found dead in Rio de Janeiro

Remains discovered buried in a trunk at an acquaintance's house

Body exhibited signs of strangulation, official cause of death under investigation

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Machado had been missing for four months prior to discovery

Authorities searching for unidentified suspect who rented the house

Family and friends seek justice and closure, hope for swift arrest of perpetrator