Authorities in Iowa have released the preliminary results of an autopsy into Mollie Tibbetts' death.
Tibbetts died from "multiple sharp force injuries," according to the Iowa State Medical Examiner's Office, which conducted the autopsy on Wednesday.
It's not been revealed yet what was used to cause the injuries.
A 24-year-old man Cristhian Rivera, has been charged with murdering the 20-year-old University of Iowa student.
Her body was found in a cornfield to the southeast of her hometown of Brooklyn, Iowa, where she went missing while jogging on July 18.
Rivera told police he couldn't remember what happened, but remembers Tibbetts being in his trunk with blood on the side of her head.
The medical examiner listed her death as being caused by homicide.
"Further examination may result in additional findings," it added.
Rivera is due to make his next court appearance next Friday, Aug. 31.