(CNN) -- A shadowy figure in the back seat of an SUV in surveillance photos is a second "person of interest" in the slaying of the University of North Carolina student body president, police said Monday.
Investigators say a second male appears in the back seat in this ATM photo, which has been colorized.
Police on Saturday released photos taken by an ATM camera that show a young man driving a sport utility vehicle possibly using one of student Eve Carson's ATM cards in the Chapel Hill area.
A large, shadowy form appears in the back seat of the vehicle, which police say may have been Carson's.
Carson, 22, was found shot to death early Wednesday in a suburban neighborhood near the University of North Carolina at Chapel Hill campus. Her Toyota Highlander was found the next day in another neighborhood to the west, close to where she lived with roommates.
"We do believe there is a second unidentified male seated in the rear seat," the Chapel Hill Police Department said in a statement. "We have been exploring ways to enhance the quality of this photo in an effort to learn more about this person."
Police have not identified the pictured driver, who was wearing a hooded sweatshirt and a vintage Houston Astros baseball cap.
Chapel Hill Police Chief Brian Curran said Saturday that Carson's killing "feels like a random crime."
The medical examiner told police that there were no injuries to Carson's body besides gunshot wounds and no signs of sexual assault, Curran said.
On Sunday, more than 1,000 people crowded the First United Methodist Church in Carson's hometown of Athens, Georgia, for her funeral, the Athens Banner-Herald reported.
The University of North Carolina will hold a memorial service for Carson after students return from this week's spring break, Chancellor James Moeser said in a statement on the school's Web site.
On Saturday, the school's top-ranked men's basketball team wore reminders of the popular student president on their jerseys as they took on Duke University in Durham, North Carolina. Watch as students remember the slain campus leader »
The North Carolina players wore patches on the jerseys that simply read "Eve," and many of Duke's fans donned small light-blue ribbons as a show of support.
A moment of silence for Carson also was held before tipoff.
The UNC-Chapel Hill board of trustees has pledged $25,000 to the Crime Stoppers program in the area for information leading to the arrest of anyone responsible in Carson's slaying. Carson was a student member of the board. E-mail to a friend
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