ALBUQUERQUE, N.M. (AP) — Prosecutors say they now believe a 13-year-old boy found in a shallow grave in Nambe was killed by the son of his mother's boyfriend.

The Albuquerque Journal reports court documents accuse 20-year-old Jordan Nunez of torturing Jeremiah Valencia daily with a homemade spear or a shock collar.

Prosecutors plan to argue at a hearing Wednesday that Nunez and the boy's mother, 36-year-old Tracy Ann Pena, be held until trial.

Both are charged in Santa Fe District County Court with child abuse resulting in death and evidence tampering.

Authorities initially suspected Nunez's father, 42-year-old Thomas Ferguson, as the one who fatally beat the boy. Ferguson was also charged but he died by suicide in jail in April.

Defense attorney Mark Earnest says any abuse by Nunez was under pressure from Ferguson.

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Information from: Albuquerque Journal, http://www.abqjournal.com