He has long been formally accused of the crimes, but now the grand jury's verdict from July has been announced.
In the published indictment, an aggravating circumstance has been added: the son is accused of lying in wait for the couple.
Nick Reiner faces the death penalty if convicted, but prosecutors say they have not decided whether to seek it.
Prosecutors have still not said anything about a suspected motive.
Nick Reiner denies the crime.
The Reiners were found stabbed to death on December 14, 2025. Their 32-year-old son Nick was arrested by police later that day.
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