The lead prosecutor in the case of Clemson University student who was strangled to death with her own bikini top said Friday that Tiffany Marie Souers' murder appears to be a sexually motivated event.

Greenville prosecutor Bob Ariail told reporters that while authorities do have a DNA profile of someone who may at some point be a suspect in the case, there is no one person being fingered for Souers' murder at this point in time.

"We brought a lot of people in" for questioning, Ariail said. "Do we have a specific suspect? The answer to that at this point is, 'no.'"

Ariail did, however, release surveillance photos of a white male trying to use Souers' bank card at an ATM a few hours after the killing. Ariail said the man, who had covered most of his face with bandanas, tried unsuccessfully to use the card six times at two cash machines. The man was driving an older sport utility vehicle. Authorities on Friday released photos of a vehicle similar to the one they believe a suspect may be driving.

"Hopefully someone will recognize an individual who has that type of headdress or bandanna, who drives a vehicle of this type, who is exhibiting the behavior profile," Ariail said.

Ariail said the crime was sexually motivated, but he said tests so far have not indicated she was sexually assaulted. He said more tests were being done.

The prosecutor urged people to be aware of any man exhibiting "any inappropriate or aggressive sexual advances."

A phone bank has been set up to receive tips. The number is 800-442-2746.

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Police are searching for a light-colored GMC Jimmy or a Chevrolet Blazer as they hunt down the person responsible for the 20-year-old Souers' death.

FOX News has also learned that police have recovered Souers' driver's license. The owner of a tow shop in South Carolina told FOX News that a man picking up trash on Highway 123, close to the university, found the ID. The man took the ID to the auto body shop and police were contacted. Authorities are now searching the area for additional evidence.

Ariail told reporters Thursday that the suspect was "candidly photographed undertaking a transaction that specifically connects him with the victim, post her death."

Police are also searching for the sheets that were missing from Souers' bed when she was found on the floor of her apartment, a source close to the investigation told The Greenville News. After an extensive search, investigators fished a set of sheets from a river, but they turned out not to be hers, the source said.

Click here to read The Greenville News story.

Jim Souers, the victim's father, said he doesn't think the investigation is moving quickly enough.

"I would hope that everyone is doing everything possible and then some," he said in a phone interview. "Someone needs to be found."

Mourners packed the Church of the Annunziata in Ladue, Mo., Thursday to say goodbye to Souers.

Bren Souers said her daughter loved life and immersed herself in opportunities of service.

"She got so much from giving," she told the St. Louis Post-Dispatch. "It filled her up. It made such a difference and she had so much more to do ... she had so much more to give.

"I miss her so much already."

Click here to read the Post-Dispatch story.

Police who had been searching Souers' computer have developed a timeline of her whereabouts up until 12:03 a.m. last Friday. They were also searching her cell-phone records for evidence and combing through a trash bin seized at The Reserve apartment complex, where Souers lived.

Investigators narrowed the student's time frame, accounting for her whereabouts up until 12:03 a.m. EDT May 26. Police believe she died around 1 a.m. Two women found Souers' body around 1:30 p.m. May 26 in her bedroom at The Reserve. She had been strangled with her bikini top and was wearing only a bra.

The junior, a civil engineering from Ladue, Mo., had been taking summer classes in order to graduate early. She was a member of Kappa Kappa Gamma sorority at Clemson and volunteered at a local charity. She was a 2004 graduate of Villa Duchesne High School, an independent Catholic girls school in suburban St. Louis, where she led the campus ministry and retreats for her class and others'.

Sam Sciortino, head of Villa Duchesne, described Souers as a well-rounded student leader.

"She was a model student, just a great young lady," Sciortino told the St. Louis Post-Dispatch.

FOXNews.com's Sara Bonisteel and Hannah Sentenac and The Associated Press contributed to this report.