New court documents released Thursday say the suburban Kansas City couple accused of the videotaped sex killing of a woman has admitted they were involved in another slaying.
Investigators say Richard D. Davis, 41, and Dena D. Riley, 39, admitted their involvement in the deaths of 41-year-old Marsha Spicer and Michelle Huff.
Sherry Ballew has told Kansas City me Barton County authorities received a call from Davis and Riley saying "they were tired of hurting people" and planned to overdose on drugs as soon as they found a place to drop off the girl.
The couple was eventually arrested on a dirt road after their truck got into a wreck.
Federal officials are investigating possible kidnapping charges.
In the court documents, police said an audio recording found in the vehicle Davis and Riley were captured in had Davis talking about other tapes that had been made. Investigators said they think that means there are other videotapes showing women being tortured and raped but they don't yet know where those tapes might be.
Earlier search warrants said investigators, looking in the couple's Independence apartment garage, found a possibly bloodstained blanket in a Chevrolet S-10 pickup and what looked like a bloodstain in the upholstery of a 1993 Toyota Corolla.
A pitchfork was found in the Corolla's trunk.
In the apartment itself, the documents say, investigators found a marijuana cigarette, a bag of a leafy substance, a laptop computer, videotapes, a roll of duct tape and pieces of duct tape with hair stuck to it.
In the video, officials said, Spicer has duct tape around her wrists and over her eyes.