On Monday, Pickens County coroner Dr. Jim Mahanes, told the paper that Tiffany Marie Souers, 20, of Ladue, Mo., did not have any defensive wounds, but that she might have struck her killer as she was strangled, leaving wounds on the attacker.
Police have received more than 200 calls to a tip line set up Friday for information about a man suspected of strangling the civil engineering student.
Authorities are searching for a young white man who may have acted in a sexually aggressive manner in connection with Souers' death.
"Law enforcement is continuing to work extremely hard on this case," 13th Circuit Solicitor Bob Ariail said in a news release Saturday. "We are very encouraged by the large response and urge those who may know something to come forward."
In addition to the possible suspect, who was photographed wearing a bandanna while trying to use Souers' bank card at two cash machines within hours of her death, police are searching for a light- to medium-colored 2-door GMC or Chevrolet SUV.
Investigators say they think the man is still in the area around the university, located in the northwest corner of the state.
The Greenville News reported Monday that police have interviewed 50 people in connection with Souers' death, which Ariail described as a sexually motivated crime, but he has not said that she was raped.
Faith Clark, the director of Sharing Inc. in Easley, S.C., where Souers volunteered, told the Greenville News that the college student was approached in Clark's consignment and resale shop at least twice by a man who spent time "hanging out, trying to get names, addresses and phone numbers and e-mails of women, trying to get hugs" over the course of a year-and-a-half.
Sheriff David Stone said many calls coming in to the tip line were from people who had been involved in domestic violence cases.
"A lot of times, you have a person that's had a domestic call and they've separated or divorced or whatever, and they'll call and give this name that I got beat up by him or her," Stone told The Greenville News Saturday. "It's things like that right now."
On Friday, Ariail released surveillance photos from the banks of a white man, whose face was covered with two bandannas, and of an older model SUV that the suspect may have been driving the night of Souers' death.
Ariail said a profile of a possible suspect leads investigators to believe the man would likely begin to withdraw from family and friends and shy away from regular activities.
While the prosecutor described the suspect as someone who may have made inappropriate sexual advances in the past, investigators don't think he was specifically waiting for Souers, who was dropped off at her apartment by friends just hours before police think she was killed.
Investigators say Souers sent a text message shortly after midnight on the morning she was killed, but would not reveal the contents of that message.
Anyone with information regarding a sexually aggressive male or anyone with a bandanna or vehicle of the kind described by investigators should call 1-800-442-2746 and press 2.
FOXNews.com's Sara Bonisteel and The Associated Press contributed to this report.