An autopsy determined that the man suspected in last weekend’s attack at Brown University and the fatal shooting of a Massachusetts Institute of Technology professor days later had been dead for two days when his body was found, New Hampshire’s attorney general’s office said Friday

Authorities found Claudio Neves Valente, 48, dead from a self-inflicted gunshot wound at a New Hampshire storage facility on Thursday night, said Providence’s police chief, Col. Oscar Perez.

The autopsy determined that Neves Valente, a Portuguese national who had been living in the U.S., died on Tuesday, the same day that his countryman, MIT professor Nuno F.G. Loureiro died at a hospital, New Hampshire Attorney General John Formella’s office said in a statement. It didn’t note an exact time of death.

Authorities believe that after killing two students and wounding nine others last Saturday at Brown, where he was a graduate student studying physics during the 2000-01 school year, Neves Valente shot Loureiro at his Boston-area home on Monday night.

Investigators on Friday were still trying to sort out why Neves Valente allegedly opened fire on the campus decades after he dropped out and later killed Loureiro, whom he attended school with in Portugal in the 1990s.

The discovery of Neves Valente’s body at a New Hampshire storage facility ended the nearly weeklong hunt for the person who killed two students and wounded nine others in a Brown lecture hall last Saturday. Investigators believe the onetime Brown student killed Loureiro in his home in Brookline on Monday. Perez said as far as investigators know, Neves Valente acted alone.

Portugal’s foreign minister, Paulo Rangel, said Friday that the government was taken aback by revelations that a Portuguese man is the main suspect in the mass shooting at Brown and the killing of Loureiro.

Rangel said Portugal has provided “very broad cooperation” in the case. He said in comments to the national news agency Lusa that “the investigation is far from over.”

Brown University President Christina Paxson said while Neves Valente is a former Brown student, “he has no current affiliation with the university.”

Neves Valente and Loureiro attended the same academic program at a university in Portugal between 1995 and 2000, U.S. attorney for Massachusetts Leah B. Foley said. Loureiro graduated from the physics program at Instituto Superior Técnico, Portugal’s premier engineering school, in 2000, according to his MIT faculty page. That same year, Neves Valente was let go from his temporary student support and faculty liaison position at the Lisbon university, according to an archive of a termination notice from the school’s president at the time.

Neves Valente, who was born in Torres Novas, Portugal, had come to Brown on a student visa. He eventually obtained legal permanent resident status in September 2017, Foley said. It wasn’t immediately clear where he was between taking a leave of absence from the school in 2001 and getting the visa in 2017.