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 say was found dead Thursday of a self-inflicted gunshot wound, was a top student but a disruptive personality in his native Portugal, recalled classmates on Friday.

Neves Valente studied at Instituto Superior Técnico along with Nuno Loureiro, the MIT professor he is now accused of shooting to death. The school confirmed to CNN that both men were students there between 1995 and 2000, and that Neves Valente studied for a degree in Technological Physics Engineering.

That engineering course was full of gifted students, recalled classmate Felipe Moura – but Neves Valente stood out, for good and bad reasons.

“Claudio was obviously one of the best, but in class he had a great need to stand out and show that he was better than the rest,” Moura wrote in Portuguese in a Facebook post.

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