A man charged with murdering the University of North Carolina student body president was arrested Wednesday as detectives hunted for a second suspect.

Police would not say which suspect they believe shot and killed Eve Carson, 22, of Athens, Ga., who was found a week ago lying on a street about a mile from campus. The biology and political science major had been shot several times, including once in the right temple.

In the days after Carson's death, police focused their investigation on several ATM and convenience store surveillance photos.

The school's Board of Trustees offered a $25,000 reward for information leading to an arrest, and police received hundreds of tips after the first two photos were released over the weekend.