Claudio Neves Valente, 48, who is believed to have killed two students at Brown University in Providence, R.I., on Saturday and a Massachusetts Institute of Technology professor in his home in Brookline, Mass., on Monday, has been found dead in a storage unit in New Hampshire, law enforcement said.

The Providence police chief said that Valente died from a self-inflicted gun wound, and the Rhode Island attorney general said that “a lot of unknowns remain,” and “we don’t know why now, why Brown, why these students and why this classroom,” the Associated Press reported.

A native of Portugal, Valente studied physics in graduate school at Brown from 2000 to 2001 but had no “current affiliation with the university,” according to the Brown president.