PARK CITY, Kan. (KAKE) - Oklahoma investigators spent Tuesday in Park City, digging up the ground where Dennis Rader's home once stood. 

The Osage County, Oklahoma undersheriff Gary Upton said that his investigators are acting on a tip received connected to the 1976 disappearance of Cynthia Kinney, who's never been located.

"It is ongoing, and we have been doggedly pursuing this and so we continue investigating until we follow all leads, some of which are very interesting," Upton said.

The Park City Police Chief Phil Bostian says the Osage County Sheriff's Office called Monday as a courtesy to let him know his deputies were going to carry out this investigation.

"To let us know they were going to be in town and asked for assistance from our Public Works department to help them do a little bit of excavating on the property," Bostain said.

Rader was convicted of ten murders spanning several years, and is currently serving life in prison.

This investigation is ongoing, and we'll bring you the latest as we learn more.