Former Kunz P.I.: DeOrr Kunz & Jessica Mitchell lied about son's disappearance

IDAHO FALLS -- A former private investigator working for Jessica Mitchell and DeOrr Kunz has released a letter he wrote the couple in September when he terminated their working relationship.

Frank Vilt agreed to investigate the disappearance of DeOrr Kunz, Jr. at the request of the Kunz family last August. A month later, he says he removed himself from the case.

Vilt tells EastIdahoNews.com he is publicly releasing the letter to clear up any misconceptions people may have about why he walked away from the prominent investigation.

In the letter, dated Sept. 25, 2015, Vilt writes:

"I told both of you that if I felt that you were not telling the truth, stalling me, or otherwise misleading me, that I would withdraw from the investigation. In my professional opinion, both of you lied and misrepresented the true facts that could solve the mystery of your missing son."

Vilt spoke with EastIdahoNews.com reporter Nate Eaton about the letter and what he believes may have happened with DeOrr Jr. Click on the video above to listen to that conversation.