According to the warrants, witnesses told investigators they believed Eric and Dea were involved in Rasmussen's death, and that both participated in a plot to dispose of her body.
The search warrant affidavit said that investigators found traces of human blood inside the Millerberg's home in a spot where the carpet and pad had been recently removed.
One warrant said that investigators tracked down a car that had been sold by Eric Millerberg through a website to a person in Utah County. The investigators later located the car and discovered that the carpet had been removed from the car's trunk.
Some of the witness statements include:
"It's something she (Dea) can't fix. Only her, her husband and one other person know about it."
The witness is also quoted as saying, "[Dea] won't tell about it to the police and that she's sorry it happened and she's too solid to tell what it is."
The same witness said, "[Dea] can't change it; she's protecting herself & husband and one other male friend."
That witness made her statement in a letter sent to investigators and received on October 9.
The witness wrote of Rasmussen's death as, "Drug related, something to do with a case. Find the car you find an answer. She's dead."
According to the warrant, the witness was in the same jail unit as Dea Millerberg when she obtained the information. She also told investigators, "Dea knows everything that happened. The girl is buried somewhere in the state she's not gone, but not alive."
In statements collected by officers on October 8, another witness told an investigator that an unidentified member of the same gang to which Eric Millerberg belongs, "...received a phone call from Eric "Rooster" Millerberg, who asked [him] to bring a car and not to ask any questions."
The same witness said that the fellow gang member claimed to be, "...very nervous when she saw him after the incident with "Rooster"."
The witness also told investigators that the fellow gang member, "...told [the investigator] that [he] even went to an attorney and talked to him about what "Rooster" had told him."
The witness is also quoted as telling investigators, "I can't believe he killed a little girl, I'm not getting involved with that."
The same witness told police that a sixteen-year-old girl had requested that Eric "shoot her up" with drugs and that she wanted to have a "threesome" involving Eric and Dea, to which Dea arranged.
The affidavit also said that Alexis was involved obtaining and selling prescription drugs to the Millerbergs.
Alexis Rasmussen was baby sitting the Millerberg's two young children on September 10, the night she disappeared.
An anonymous phone tip led investigators to a shallow grave near a highway in Morgan County on October 18th, where Rasmussen's body was recovered and sent to the state medical examiner's office.
On October 25, the Millerbergs were named as "persons of interest" in the case.
On October 26, Dea Millerberg's attorney told ABC 4 News he believed that his client and her husband would be charged in connection with Rasmussen's death and disappearance within weeks.
Stay tuned to ABC 4 News and ABC4.com for more on this story.