According to an arrest warrant affidavit released Wednesday, the wife of a former Kaufman County justice of the peace told investigators her husband shot and killed a county prosecutor as well as the district attorney and his wife.
Kaufman County District Attorney Mike McLelland and his wife, Cynthia, were found shot to death in their home on March 30. Assistant District Attorney Mark Hasse was gunned down outside the county courthouse on Jan. 31.
According to the affidavit, Kim Lene Williams confessed to her involvement in the shootings and provided police with details about the killings that were not released publicly. The affidavit also stated that Kim Williams "intentionally and knowingly cause the death of an individual ... by shooting him with a firearm" -- legal language police said outlines her involvement in the killings without going into specifics.
Lt. Justin Lewis, with the Kaufman County Sheriff's Office, said that Kim Williams told investigators her husband pulled the trigger.
In the news conference, Lewis did not describe the evidence against Kim Williams, only saying that she had been charged with capital murder and was being held on a $10 million bond at the Kaufman County Jail.
Lewis also did not say anything about her husband, Eric Williams, who was arrested over the weekend and charged with making terroristic threat.
As of Wednesday night, Williams had not been charged in the slayings of the McLellands or Hasse and remained jailed on a $3 million bond.
The overnight arrest of Kim Williams, who has been described as frail from debilitating arthritis that is so severe it is impossible for her to work, was a shocking twist in the investigation into killings of the McLellands and Hasse.
As the investigations narrowed on her husband, she remained her husband's alibi.
Neighbors told NBC 5 that although Kim Williams was ill, she had good days and bad and could often be seen riding around the neighborhood on a large tricycle while her husband rode a Segway, they said.
Neighbors of the McLellands said they are relieved that an arrest has been made in the case.
"I can finally tell my kid, and kids in this neighborhood, that the bad people are put away," one neighbor said.
David Crone, another neighbor, said the arrest would end a lot of speculation.
"It'll put a lot of closure to a lot of guessing up and down the street -- people wanting to know what happened and how it happened," he said.
Officials said another news conference about the cases would be held at 1:30 p.m. Thursday.
NBC 5's Scott Gordon, Randy McIlwain and Ray Villeda contributed to this report.