Richard Allen was convicted in November in the killings of 13-year-old Abigail Williams and 14-year-old Liberty German.
45% of Kentucky women and 35% of Kentucky men experience intimate partner physical violence and/or rape in their lifetimes.
Harrison County Prosecutor Otto Schalk said Chaz Davis is incarcerated in Kentucky on unrelated charges but will be extradited to Indiana to face charges in the murder of LilDon Williams.
Harrison County Prosecutor Otto Schalk said he expects charges against a second suspect "will be filed imminently."
Police said two men followed him to southern Indiana and waited for three hours. As Williams approached his car, the two men opened fire with assault-style weapons.
It's unclear how Reid and Linson initially met.
Prosecutors in Indiana said the couple may have taken hundreds of thousands of dollars from several customers.
The former pool company owner was accused of fraud and theft and is scheduled to go to trial early next year.
Police said the child was distraught and her hands were covered with her mother's blood at a crime scene in southern Indiana.
Malcolm Williams' family filed a federal lawsuit in 2021 against Indiana State Police Trooper Clay Boley.