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Burnt remains found in a Tennessee home have been identified as belonging to missing woman Silvia Vilchez

Her husband David Gardiner and son Gabriel Vilchez were arrested on murder charges

Gabriel allegedly told police Gardiner, who is his stepfather, watched him beat Silvia before helping him burn her body

A Tennessee teen and his stepfather appeared in court this week in connection with the alleged brutal killing of his mother, whose charred body was found in the family's backyard in October.

Officers arrived at a Graysville, Tenn. home on Oct. 28, to inquire about 50-year-old Silvia Vilchez after she was reported missing, the Sequatchie County Sheriff's Office confirmed to PEOPLE in a statement.

Her husband David Gardiner, 64, and 18-year-old son Gabriel Vilchez told

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