A source close to the investigation tells NBC 5 that dive teams are searching Lake Tawakoni for weapons related to the murders of Kaufman County prosecutors Mark Hasse and Mike McLelland, as well as McLelland's wife, Cynthia.
Texas Department of Public Safety dive teams are searching the "Two Mile Bridge" portion of the lake after receiving a tip stating that evidence could be found in the area.
A spokesperson for the Kaufman County Sheriff's Office would not confirm to NBC 5 that the search was connected to the killings of Hasse and the McLellands, but did confirm their office was working with Texas DPS and other law enforcement organizations to search the lake.
Former Justice of the Peace Eric Williams and his wife, Kim, have been charged with capital murder in all three deaths.
In January, a judge ruled that the trial for Eric Williams would be moved from Kaufman County to Rockwall due to debate over whether Eric Williams would be able to receive a fair trial.
Authorities are still building the case against the couple, who are scheduled for trial later this year. They have not yet found the weapon used in the killings.
While investigators said they found several weapons in a storage locker used by Eric Williams, testing has not definitively linked the weapons to the shootings. Investigators said they did locate a Ford Crown Victoria that matches security video of a car in the McLellands' neighborhood the day they were killed.
The McLellands were found shot dead in their home last March, about two months after Hasse was gunned down outside the local courthouse.
Mike McLelland and Hasse successfully prosecuted Eric Williams on charges that he stole three county-owned computer monitors from an office building. The conviction cost Williams his job and law license, in a situation that Williams would call a "tragic misunderstanding that has taken my livelihood and reputation."
According to an arrest warrant, authorities have traced emails to a computer in Williams' home in which the author confessed to killing all three people. Williams also faces a charge of making a terroristic threat in connection with those emails.
According to documents filed by authorities, Kim Williams confessed to the killings and identified her husband as the shooter.