Thomas' attorney, Ed Blau, said last week, “As we stated previously, we're not going to comment because it's an ongoing investigation.”
Julie Mitchell's body was found in the closet of the master bedroom of the house, valued at the time at $359,000.
About $30,000 was missing from a safe in that closet, Teddy Mitchell's attorneys have said.
Julie Mitchell was 34. The Mitchells' daughter, then 1, was found unharmed in a pool of blood next to the body.
Teddy Mitchell was traveling by plane out of state at the time of his wife's attack, his attorneys have said.
The Oklahoman first learned in April that a clue linked Thomas to the crime scene.
“Before or during her murder, he was there,” Teddy Mitchell's attorney, Scott Adams, said in April. “I'm totally 100 percent convinced of that. Some things ... were left at the house ... . There's something that wasn't there when Teddy left.”
The attorney refused in April to reveal what the evidence was.
Adams declined to comment further last week. He said he did not want to jeopardize the investigation. “It's too sensitive,” Adams said.
After his wife's death, Teddy Mitchell sued Thomas over an alleged $20,000 debt. The Oklahoma County lawsuit claims Thomas asked to borrow the money in November 2010 and was supposed to have paid the money back within weeks.
Thomas has denied he owes the money.
Thomas filed a bankruptcy petition last November, listing almost $330,000 in liabilities. He asked a bankruptcy judge to allow him to make monthly payments over five years to take care of his debts.
He also wanted the judge to rule he didn't owe Teddy Mitchell.
The bankruptcy judge in April rejected his payment plan and dismissed the bankruptcy case.
The lawsuit against Thomas over the alleged $20,000 debt is still pending.
Thomas last year refused to testify before the state grand jury. His attorney at the time said then that Thomas did not want to incriminate himself in any of Teddy Mitchell's gambling activities.
Thomas' ex-wife, Shannon Elder, of Edmond, has said Thomas regularly went to Teddy Mitchell's house to play poker.