NEW YORK (WEAU) -- Eau Claire County Judge Jon Theisen appeared on national television Friday morning, talking about his part in helping to solve a double-homicide case that happened 18 years ago.
Judge Jon Theisen appeared on Megyn Kelly's show on Friday.
The discussion centered on an unsolved double murder in Florida that's the subject of a new TV show called 'True Conviction'.
Theisen was the Chippewa County District Attorney in 2000 when Bill Marquardt was acquitted for killing his mother in the Town of Eagle Point. Marquardt was eventually convicted of killing two women in Florida after Theisen says he wouldn't give up on the case.
“I knew I had unidentified DNA on a knife and it belonged to two women who were unrelated to one another and I guess the assumption was that it had to be related to a violent crime and probably a murder,” said Theisen.
Theisen was joined on the show with an investigator from Sumter County Florida and 21-year-old Page Ruiz, who at age three was a witness to the murders of her grandmother and aunt in their Florida home.