Max Cahill - Unsolved Case File

On October 26th, 1995, the campus of a small Georgia college, Tubman University, was shocked by the brutal murder of the newly-appointed dean of the history department.

The victim, Max Cahill, was working late in his office when the killer bludgeoned him to death. Despite several viable suspects, police were forced to close the case because they couldn't determine how the killer got to Max while avoiding detection by video surveillance cameras.

Your job is to solve the mystery by finding evidence that will re-open the case and convict the real killer. But who was it?