(NewsNation) — A man who pleaded guilty to sending fake ransom notes about Nancy Guthrie has been ordered to complete inpatient substance abuse treatment.

Derrick Anthony Callella was arrested in February after the FBI discovered that he was sending fake ransom notes to Guthrie's daughter, Annie Guthrie, and son-in-law, Tommaso Cioni.

He is facing two counts of harassment using a telecommunications device.

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Callella's sentencing hearing is set for Sept. 10, and the judge ordered him to live at an inpatient substance-use treatment facility or halfway house in the meantime, Fox News reported. Callella is required to comply with the program he enters and contribute toward the cost of the treatment.

If he fails to do so, the U.S. Marshals Service is authorized to remove him and place him in temporary custody. After the treatment is completed, Callella will be allowed to live at a home approved by the court.

Investigators believe that Nancy Guthrie, 84, was abducted from her home in the early hours of Feb. 1. The FBI has said the case is being investigated as a kidnapping for ransom.

In the days following Guthrie's disappearance, ransom notes were sent to the family and media outlets. Recent reporting indicated that one note suggested that Guthrie had died. None of the ransom notes led to Guthrie's return or the identification of any suspects.

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Investigators said Callella is not responsible for the ransom notes sent to the media. Those remain under investigation, and authorities have not officially determined whether they are legitimate or not.

Callella faces up to two years in prison for each count, with fines up to $250,000, and is expected to have up to one year of supervised release after he serves his sentence.

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