Newcomb, 66, will be found guilty of obstructing justice in connection with the 2016 massacre in Pike County.
All other charges were dropped.
She has been charged with forgery, perjury and obstruction of justice.
The charges are related to execution killings by eight members of the Rhoden family in Pike County in 2016.
Newcomb is the mother of the murder suspect Angela Wagner and the grandmother of two other suspects, George and Jake Wagner. Angela's husband, Billy Wagner, is also charged with murder.
Newcomb is accused of falsifying custody documents for Jake Wagner's baby and one of the victims, Hannah Mae Rhoden.
