Updated: 2 p.m. | Posted: 5:55 a.m.
North Dakota prosecutors filed murder conspiracy and kidnapping conspiracy charges Monday afternoon against two suspects in the death of 22-year-old Savanna Greywind. Investigators are also probing an abandoned northwestern Minnesota farmstead as a possible crime scene.
Brooke Lynn Crews and William Henry Hoehn were charged with three counts each, including providing false information to law enforcement.
Greywind, who'd been eight months pregnant, was last seen at her Fargo, N.D., apartment Aug. 19. The quest to find her intensified when police found a newborn baby Thursday and arrested Crews for kidnapping.
The suspects indicated to police that the infant was Greywind's, but would not answer questions about her whereabouts.
Her body was found Sunday wrapped in plastic and duct tape in the Red River by kayakers. It was sent to St. Paul for an autopsy by the Ramsey County Medical Examiner's Office. Authorities said preliminary findings on the cause of death may be available this week.
"Savanna was the victim of a cruel and vicious act of depravity," Fargo Police Chief David Todd told reporters Monday in an update on the inquiry.
Fargo police are working now with the Minnesota Bureau of Criminal Apprehension and the Clay County Sheriff's Office in Minnesota to investigate the farmstead, where "suspicious items" were found, Todd said. He did not describe the items.
Investigators said they were alerted to the farmstead as a possible crime scene by citizens who had responded to police appeals for help in finding Greywind. They say there's no indication that there are any other suspects involved in the crime.
The Associated Press contributed to this report.