Capt. Sam Houston, of the Sedgwick County Sheriff's Office, shows a mask during BTK serial killer Dennis Rader's sentencing hearing Thursday. It was found with victim Dolores Davis' body ...

Oklahoma officials may have tied a cold case disappearance to the infamous BTK serial killer. Dennis Rader, 78, is serving 10 consecutive life sentences after pleading guilty to 10 murders in 2005.

Convicted BTK killer Dennis Rader listens during a court proceeding, Oct. 12, 2005, in El Dorado, Kan. (Travis Heying/The Wichita Eagle via AP, Pool, File) (AP) — The BTK serial killer has been named ...