Former classmates describe accused Brown shooter as ‘brilliant’ but arrogant and difficult

By Duarte Mendonca, Allison Gordon, Tim Elfrink, CNN (CNN) — As investigators work to find a motive behind the mass shooting at Brown University and the slaying of an acclaimed MIT professor, former classmates of the accused killer described him as a brilliant but exceptionally difficult student. Claudio Neves Valente, the 48-year-old suspect who police