Kansas City, Mo. ? A suburban Kansas City couple accused of the videotaped sex killing of an Independence woman have admitted that they videotaped and killed a second woman, court documents released Thursday show.

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, also known as Michelle Ricci.

Sherry Ballew has told Kansas City media outlets that she thought a body discovered last weekend in Clay County and linked to the Spicer investigation was that of her 36-year-old daughter, Ricci.

At a news conference Thursday evening, Jackson County Prosecutor Mike Sanders said the body had not been officially identified as Ricci, but added that “all our information indicates that is the case.”

Sanders said Davis and Riley told authorities after they were arrested that the woman was assaulted in Independence, driven to Clay County, strangled, burned and buried. He said Davis took them to the area near Liberty where the body was found.

Davis and Riley face charges of first-degree murder, first-degree assault, kidnapping, rape and sodomy in Spicer’s death. They have not been charged with Ricci’s death.

The documents also say the 5-year-old girl traveling with Davis and Riley when they were arrested last week in southwest Missouri had suffered injuries consistent with sexual abuse.

Search warrants filed with the Jackson County court in recent days also said the couple told investigators they had made “other videotapes” similar to the one in which police have said Spicer is seen being beaten, sexually assaulted and strangled. Davis said the tapes police already had found represented just “bits and pieces” of what they had made.

Sanders said no information had surfaced to indicate there were other victims, but he said investigators continued to receive numerous tips in the case. He also said evidence indicated that neither woman was a willing participant in the videotaped sex acts, and that Ricci was killed before Spicer.

Richard Davis is shown in a police booking photo taken May 26, 2006, in Independence, Mo. He is charged with Dena Riley, in the rape and killing of Marsha Spicer. They're also accused of videotaping. her sexual assault and beating.

This undated file photo from the police shows Dena Riley, 39, who is accused of videotaping the rape of a woman and killing he. She and Richard Davis might have other victims in their past, authorities said Saturday May 27, 2006.

An evidence log filed with the documents said investigators found a plastic bag with videotapes in a storage room at Davis’ workplace.

Spicer’s naked body was found May 15 in a shallow grave in Bates City, east of Kansas City.

After spending eight days on the run, Davis and Riley were captured by police when the couple’s vehicle was in an accident in southwest Missouri. A 5-year-old girl was with the couple.

According to search warrants filed with the Jackson County court, a doctor at Barton County Memorial Hospital who examined the girl told investigators the child, who is identified as being Davis’ niece, suffered serious injuries “believed to be from a sexual assault.”

The court documents said the girl’s mother alerted Pittsburg, Kan., police the afternoon of May 25, saying Davis – her half-brother – and a woman later identified as Riley had taken her daughter and disappeared on the way to lunch.

The mother said Davis told her that he wanted to reconnect with the family after spending 21 years in prison. Davis actually spent 18 years in prison for rape and sodomy.

Around 5 p.m. that day, the documents say, 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 eventually were arrested on a dirt road after their truck was in a wreck.

Federal officials would make any decisions on charges in the case involving the girl.

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.