Detectives investigating the slaying of the University of North Carolina's student body president, Eve Carson, focused Monday on a suspect pictured in several surveillance photos using her ATM card.

Police released two new photos Monday evening of a young man wearing jeans and a black coat inside an area convenience store. Chapel Hill Police Chief Brian Curran said the man appears to be the same person seen in two ATM surveillance photos released Saturday.

Chapel Hill Police Department (ENLARGE)

These photos taken from an ATM camera were released Saturday by Chapel Hill police. Police Chief Brian Curran said the man appears to be the same person seen in the convenience store surveillance images.

Chapel Hill Police Department (ENLARGE)

This undated image made from a surveillance camera and released Monday by the Chapel Hill, N.C., Police Department shows a man police call a 'person of interest' in the slaying of University of North Carolina student body president Eve Carson.

Chapel Hill Police Department (ENLARGE)

Chapel Hill Police Chief Brian Curran said Monday that detectives now have a photo of the suspect attempting to use Carson's ATM card at a convenience store.

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In those pictures, the suspect is seen in a baseball cap and hooded sweat shirt driving a sport utility vehicle that may be Carson's Toyota Highlander. Curran said Monday the man in the two new photos is the only person inside the store when Carson's ATM card is used.

Earlier Monday, police said they are trying to enhance the first two photos. They clearly shows the driver of the SUV, who is wearing what appears to be a vintage Houston Astros hat, but detectives also believe a dark shape in the photos is a male passenger in the rear seat.

Police have declined to say when the surveillance photos were taken or the exact location of the ATM machine and convenience store, but Curran said Monday the same ATM card was used when all four photos were taken. He would not say if any money was successfully withdrawn from Carson's account.

"It still feels like a random crime to us," Curran said.

Carson, 22, of Athens was found last week lying on a street about a mile from campus after police received two 911 calls reporting gunshots. She had been shot several times, including once in the right temple. Her SUV was found the next day a few blocks from her home.

According to a search warrant, police found Carson's cell phone near a shopping center located on the main road between Chapel Hill and Durham. Detectives have yet to locate her wallet or keys. They retrieved Carson's laptop and memory cards from her campus office, according to the warrants.

Carson's death led to a widespread outpouring of grief at North Carolina, where thousands gathered last Thursday at two memorials to remember the senior biology and political science major. At North Carolina's men's basketball game against archrival Duke on Saturday night, thousands of fans — including those rooting for the Blue Devils — wore Carolina blue ribbons in her honor.

Police said Monday they received roughly 200 tips this past weekend. The school's Board of Trustees, of which Carson was a member, has offered a $25,000 reward for information leading to an arrest in her death.

"We've been really truly blessed with the outpouring of support we've had from both the community here in Chapel Hill and from other law enforcement agencies," Curran said. "It's really been really nice to see. Everybody's really coming together trying to get this case solved."

In another case involving a female student, Auburn University in Alabama has begun new security measures since 18-year-old Lauren Burk's abduction and shooting death.

Maj. Melvin Owens, Auburn's executive director of security and public safety, said Monday the school has increased the hours of its security shuttles and has implemented an escort service for students leaving the library.

Burk was found about five miles from the university last Tuesday and her car was later found burning in a campus parking lot.

Courtney Lockhart, arrested on capital murder charges, is accused of kidnapping, robbing and attempting to rape Burk. Lockhart, who lived in rural Smiths in Russell County, was arrested in Phenix City on Friday after a chase and was to make a court appearance Monday.

Police have said there was no indication the killings of the two students were related.

Lockhart served with the Army in Iraq from August 2004 to July 2005. At Fort Carson, in 2006, he was convicted on military charges of communicating a threat and use of marijuana as well as assault, said Maj. Nathan Banks, an Army spokesman at the Pentagon. Lockhart was sentenced to seven months' confinement and given a bad conduct discharge.

Banks said the records he has available do not indicate who was assaulted, but the victim would have been in the military since the case was handled by the military rather than civilian police.

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Associated Press writer Desiree Hunter contributed to this report from Auburn, Ala.