KAUFMAN, Texas (AP) — Texas authorities investigating the killings of a district attorney and his wife are working to build a case against a former justice of the peace prosecuted last year by the slain official’s office, a law enforcement official said Monday.

Eric Lyle Williams, 46, was arrested during the weekend and remains jailed on a charge of making a terroristic threat. He is being held on $3 million bond, but authorities have not publicly discussed details of the charge against him.