AP VIDEO REPORT

The photos show a man using a drive-up ATM machine. Police have not disclosed the location of the ATM.

Police also have released a photo of the type of baseball cap the man was wearing.

Chapel Hill Police Chief Brian Curran says they have yet to identify the suspect, but the photos are their strongest lead in the case. Police say Carson appears to be the victim of a random crime.

The 22-year-old Carson was found shot to death early Wednesday on a city street not far from campus.

Carson was last seen alive at 1:30 a.m. Wednesday, when she stayed home to do schoolwork while her roommates went out, authorities said. But they aren't clear why she was out at 5 a.m., when a report of shots fired was called in to police.

Curran said there was no sign of a break-in at her home or any evidence she was having trouble in a relationship that might have led to a conflict.

``As far as I know, she wasn't having any problems with anybody,'' Curran said.

Carson was a prestigious Morehead-Cain scholar and a North Carolina Fellow, taking part in a four-year leadership development program for undergraduates. A premed student, she majored in political science and biology, taught science at a Chapel Hill elementary school, studied abroad in Cuba and spent summers volunteering in Ecuador, Egypt and Ghana as part of a school program.

University Chancellor James Moeser has said there is nothing to link Carson's slaying to anyone on campus, where the news of her death has led to a widespread outpouring of grief.

``It's just a huge blow. It's a blow against everything we assume about ourselves, about being a peaceful, safe place where kids come,'' Moeser said Friday. ``She was a joyful person. She loved this place. She loved being here.''

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