Kansas City, Mo. ? An Independence couple already accused in the videotaped sexual torture and death of a woman in Jackson County were charged Thursday with murdering another woman in a neighboring county.

Richard D. Davis, 42, and Dena D. Riley, 40, are charged in Clay County with one count each of first-degree murder in the April 9 suffocation of Michelle Ricci, 36. Her charred, skeletal remains were found May 27 in rural Clay County, just north of Independence.

Riley and Davis remain jailed in Jackson County on charges of murder, rape, kidnap and sexual assault in the May death of Marsha Spicer, 41, as well as a sexual attack on Ricci.

Authorities have said videotapes showing the defendants committing brutal sex acts on the two women – Spicer on May 14, Ricci on April 8 – turned up in the couple’s Independence apartment.

Ricci’s death came to light after Davis and Riley were captured May 25 in southwest Missouri and brought back to the Kansas City area to be charged in Spicer’s death. Both defendants led investigators to Ricci’s remains.

According to court documents filed in Clay County, Davis and Riley told investigators they decided Ricci had to be killed to prevent her from reporting the April 8 sexual attack.

Ricci was kept drugged for more than a day while the defendants figured out what to do with her, Riley told investigators.

On the night of April 9, the pair placed Ricci – by then fully conscious and clothed – in the back seat of a car and drove to rural Clay County. Davis got out with Ricci and told Riley to drive around until he sent a text message instructing her to return to the site, according to court documents.

Davis ordered Ricci to remove her clothing and tried to strangle her, but ended up suffocating her by covering her mouth and nose, according to the documents. He then summoned Riley, and they drove away.

They returned to the site 24 hours later. Davis poured lighter fluid on the body and set it on fire, according to the court documents. On the way back to Independence, they threw Ricci’s shoes off a bridge into the Missouri River and disposed of other items in trash cans at two convenience stores.

The site where Ricci died is about 20 miles west of the spot in rural Lafayette County where a fisherman found Spicer’s body May 17, triggering the investigation that led to charges in both women’s deaths.

Riley and Davis also have been indicted in Kansas on a federal charge of kidnapping a 5-year-old southeast Kansas girl related to Davis after fleeing the Kansas City area.

The girl was with the couple when they were captured May 25 in southwest Missouri. Court documents said the child had injuries consistent with sexual abuse.