The trial was set during a preliminary hearing in Ogden on Tuesday.
Prosecutors say Eric Millerberg was responsible for the death of the 16-year-old, and charged him with 1st Degree Felony Child Abuse Homicide, Obstruction of Justice, Unlawful Sexual activity with a Minor, and Abuse or Desecration of a Human Body in connection with Rasmussen's death.
Eric's estranged wife Dea Millerberg was charged separately with 3rd Degree Felony Abuse or Desecration of a Human body in connection with the case.
Results of an autopsy determined that Rasmussen died from a drug overdose.
Prosecutors say Alexis died at the Millerberg residence after receiving drugs from Eric.
Alexis Rasmussen's body was found in a shallow Morgan County grave more than a month after she disappeared while babysitting for the Millerbergs on September 10, 2011.
During an April hearing, Dea Millerberg testified against her husband, detailing how sex and drugs were involved in the death of Rasmussen.
Dea Millerberg testified that she picked up 16-year-old Rasmussen on September 10 to babysit the couple's young children.
Millerberg detailed how no babysitting happened on that night, and how Alexis used methamphetamine and heroin with Eric.
Prosecutors have alleged that Alexis stopped breathing and died, either late at night on September 10 or early in the morning of September 11.
Millerberg also testified that the couple also engaged in a sexual 'threesome' with Rasmussen.
After the couple found Rasmussen dead, they drove to a remote are of Morgan County and disposed of her body.
Dea Millerberg is expected to appear in court on Wednesday.