Residents of a Boston-area neighborhood were left in shock following the fatal shooting of MIT professor Nuno Loureiro inside his apartment building earlier this week. The unexpected tragedy has left the community grappling for answers.

According to the Norfolk District Attorney’s Office, Loureiro was shot at the entrance of his Brookline apartment on Monday night. He was rushed to a nearby hospital but succumbed to his injuries by Tuesday morning.

In the aftermath, less than a day later, neighbors convened outside Loureiro’s three-story residence to honor him and voice their unease about such violence occurring in their typically serene area.

“It’s frightening to think this happened in Brookline,” Lloyd Rosenthal, a community member, expressed to Boston 25 News. “This place is meant to be safe, yet everyone is silent.”

MIT Professor Nuno Loureiro was tragically killed at his residence on Tuesday, Dec. 16. (Jake Belcher)

The Brookline Police Department, alongside the Norfolk County District Attorney’s Office, is actively investigating the circumstances surrounding Loureiro’s death, as stated by the Massachusetts State Police to Fox News Digital. At present, no suspects have been identified.

“I heard three loud bangs,” an unnamed neighbor told Boston 25 News. “I thought at first it was somebody in our apartment kicking in the door or something.”

“I don’t know what happened or why it happened,” neighbor Anne Greenwald told the outlet. “It’s very scary, though. We’re living in such terrible times right now that it seems like violence is just happening everywhere.”

Eurydice Hirsey, another Brookliner, told Fox News Digital she met Loureiro through his wife, Ines, and that the couple shares three children ranging in age from elementary school to college. 

“We take [dance] classes together several times a week,” she said. “I just saw her last night.”

“It’s a family that’s feeling such raw horror… terror,” said Hirsey. “And what do you do with something that’s indescribable?”

Locals gathered in Brookline, Massachusetts, on Tuesday night to mourn the loss of MIT professor Numo Louriero, who was murdered in his apartment on Monday. (Andrea Margolis/Fox News Digital)

Hirsey’s husband added that the “only answer to terrorism is a strong civil society.”

“And in the meantime, we face a lot of hate and suffering,” he said. 

The renowned professor joined MIT in 2016 and was appointed to the helm of the school’s Plasma Science and Fusion Center last year, where he aimed to research and expand clean energy technology, according to The Associated Press. The center stands as one of the school’s largest laboratories and had over 250 employees when Loureiro was selected as its leader, the school’s website stated. 

A crowd of people holding candles gather outside the home of Massachusetts Institute of Technology professor Nuno F.G. Loureiro in Brookline, Tuesday, Dec. 16, 2025. (AP Photo/Leah Willingham)

Speaking to reporters on Tuesday, Ted Docks, special agent in charge of FBI Boston, said investigators have found no connection between Loureiro’s death and the shooting at Brown University – located about 50 miles away – that left two students dead and nine injured over the weekend.

MIT Professor Nuno F.G. Loureiro shakes hands with Rafael M. Grossi. (rafaelmgrossi via X)

Loureiro was an accomplished researcher and leaves behind his wife and three children. He studied physics at the Instituto Superior Técnico in Lisbon, Portugal, in 2000, and later earned a doctorate in physics at Imperial College London in 2005. 

Loureiro completed postdoctoral work at the Princeton Plasma Physics Laboratory from 2005 to 2007, and at the UKAEA Culham Centre for Fusion Energy from 2007 to 2009. Before joining MIT in 2016, Loureiro held a research position at the Institute for Plasmas and Nuclear Fusion at IST Lisbon. 

The Brookline Police Department, Norfolk District Attorney’s Office and Massachusetts State Police did not immediately respond to Fox News Digital’s request for comment. 

“Our deepest sympathies are with his family, students, colleagues, and all those who are grieving,” MIT spokesperson Kimberly Allen wrote in a statement to Fox News. “Focused outreach and conversations are taking place within our community to offer care and support for those who knew Prof. Loureiro, and a message will be shared with our wider community.”

In a statement posted to social media, U.S. Ambassador to Portugal John J. Arrigo added, “I extend my deepest condolences to the family, friends, and colleagues of Nuno Loureiro, who led MIT’s Plasma Science and Fusion Center. We honor his life, his leadership in science, and his enduring contributions.”