The suspect, identified late Wednesday as Stephen Morgan, has not been apprehended, Wesleyan spokesman David Pesci wrote in a statement posted on the university's website at 6:25 a.m.
At about 1 p.m. Wednesday, Morgan walked into the Red & Black Café inside Broad Street Books near the campus and shot junior Johanna Justin-Jinich, who worked there. She was rushed to Middlesex Hospital, where she was pronounced dead.
A SWAT team that had been practicing nearby quickly responded and cordoned off the area, and the Wesleyan campus was locked down. The university's annual "Spring Fling" celebrations were canceled.
Later, students dropped plans for a candlelight vigil to remember Justin-Jinich because officials warned against any such gathering.
The university sent an e-mail to students shortly after 7 p.m. saying, "Based upon additional information found processing the crime scene, we would recommend Wesleyan students and Middletown residents remain vigilant."