OSAGE COUNTY, Okla. (KFOR) — The Osage County Sheriff’s Office in Oklahoma went to Park City, Kansas, in late August, searching on serial killer Dennis Rader’s property.

The Osage County Sheriff told KFOR Rader gave the tip. That’s why they went to the location in the first place.  

“We found personal type items and maybe some restraint type items in those locations,” said Sheriff Eddie Virden, Osage County Sheriff’s Office. 

Rader’s one of America’s most notorious serial killers who is still alive today behind bars. He’s also known as BTK, which stands for bind them, torture them, kill them. 

The Osage County Sheriff’s Office said Park City Public Works moved some cement so authorities could dig on the BTK killer’s former property. 

On August 23, law enforcement confirmed they recovered “items of interest” related to unsolved disappearances of people in Oklahoma. 

On Monday, District Attorney Mike Fisher says “..the information that has been shared is insufficient to file criminal charges against Dennis Rader.”

Fisher says there is a strained relationship between himself and the Osage County Sheriff.

Fisher has asked the OSBI to open a formal investigation into the disappearance of Cynthia Dawn Kinney who has been missing for 47 years.

Mike Fisher, District 10 DA (KFOR)

“While there have been prior investigations into Ms Kinney’s disappearance, I feel it is incumbent upon me, as the District Attorney, to do everything possible to ascertain whether Dennis Rader or someone else was involved in her disappearance,” Mike Fisher said. “Toward that end, the OSBI will pursue all reasonable leads to identify those who may or may not have been involved in Ms. Kinney’s disappearance. If evidence comes to light that is sufficient for the filing of charges, the District Attorney’s Office in District 10 will file those charges as appropriate and as the law requires.”