The suspect in the killing of a nursing student on the University of Georgia campus used an object as a weapon in the crime and is accused of “disfiguring her skull,” according to newly filed arrest affidavits.

Jose Ibarra, who faces multiple murder and assault charges, is also accused of dragging 22-year-old Laken Riley to a secluded area Thursday, according to one of the affidavits obtained Tuesday by The Associated Press. The allegation that he dragged Riley’s body was filed to support the charge of concealing the death of another person.

Authorities have not said exactly how Riley was killed, only that her death was caused by blunt force trauma. Further details about the type of object used, or exactly how she was killed, are not included in the affidavits for arrest. The affidavits filed in Athens-Clarke County Superior Court state that the crimes were committed between 9 a.m. and 1 p.m. Thursday.

District Attorney Deborah Gonzalez, who oversees prosecutions in Athens-Clarke, said Monday that she’s bringing in a special prosecutor to handle the charges against Jose Ibarra. Gonzalez, who’s up for reelection this year, has been under fire as an ineffective prosecutor, losing several cases and seeing a number of assistant district attorneys depart her office.

Gonzalez said she will appoint Sheila Ross, who now works for the Prosecuting Attorneys Council, a state agency that trains and supports prosecutors, to oversee the case.

Ibarra, 26, is a Venezuelan citizen who immigration authorities say unlawfully crossed into the United States in 2022. It’s unclear whether he has applied for asylum. Riley was a nursing student at Augusta University’s Athens campus, after starting her college career at the much larger Athens campus of the University of Georgia. She was found dead Thursday after a roommate reported she didn’t return from a morning run in a wooded area of the University of Georgia campus near its intramural fields.

Republican lawmakers in Georgia are also considering laws intended to crack down on immigration after Riley’s death. The House Governmental Affairs Committee on Monday advanced House Bill 1359 to the full House for more debate. Sponsored by Athens Republican Houston Gaines, the bill would let people seek to have their property taxes refunded if cities or counties refused to communicate with immigration authorities or if sheriffs refuse to check a suspected immigrant’s legal status.