Authorities say a missing Rapid City woman was found dead recently, and they are calling her death a case of murder-for-hire and have arrested five local people all on charges related to her death.

Jessica Rehfeld, 22, was found Saturday in a remote, as-yet undisclosed location south of Rockerville by detectives with the Rapid City Police Department and investigators with the Pennington County Sheriff's Office. Authorities said a witness statement directed them to the victim. Rehfeld was first declared a missing person in May 2015.

During a press conference on Tuesday, authorities said they believe Rehfeld's death was a contract killing, and have arrested three people on charges of first-degree murder in connection with her death.

They are: Jonathon Klinetobe, 26, of Sturgis; David Schneider, 24, of Rapid City; and Richard Hirth, 35, of Rapid City.

Authorities said Klinetobe was an ex-boyfriend of Rehfeld's. Police say they believe Klinetobe offered Schneider and Hirth "thousands of dollars" to murder Rehfeld.

According to a press release issued Tuesday: Authorities were contacted by the Newfield Police Department on May 13 that a witness had come forward with information about a homicide in 2015. After police contacted the witness, they conducted a search and found two grave sites. Rehfeld's body was found in one of them.

Police say that on May 18, 2015, Schneider and Hirth offered to give Rehfeld a ride to work, but instead drove her to a secluded service road on Rapid City's northeast side. There she was stabbed to death, and her body was placed in a bag. After that, Schneider and Hirth picked up Klintobe and the three men buried Rehfeld south of Rockerville.

Within a couple of weeks, Klintobe enlisted two others to help hide the victim's body by moving it to a second grave site located near the first one. Arrested on accessory to murder charges were 24-year-old Michael Frye and 29-year-old Garland Brown, both of Rapid City.