Police say no suspect is in custody after the Monday night shooting of physicist Nuno F. G. Loureiro, 47.
BROOKLINE, MA — An MIT professor was shot at his apartment on Gibbs Street on Monday night and died at a hospital Tuesday morning, authorities said, launching a homicide investigation that left a Boston-area neighborhood on edge and police searching for whoever pulled the trigger.
The killing of Nuno F. G. Loureiro, 47, a nuclear science and engineering professor who directed MIT’s Plasma Science and Fusion Center, stunned colleagues and neighbors and drew condolences from government officials in Massachusetts and Portugal. As of Wednesday, police had announced no arrests and released no suspect description. Investigators from the Norfolk County district attorney’s office, Brookline police and Massachusetts State Police were reviewing evidence and canvassing the area. The case drew heightened attention because Loureiro was a prominent scientist whose death comes amid renewed debate over public safety in Boston’s inner suburbs.
Officers responded to reports of gunfire around 8:30–9 p.m. Monday on Gibbs Street, a residential block near Commonwealth Avenue and the Green Line. Police found Loureiro suffering from multiple gunshot wounds and transported him to a Boston hospital, where he was pronounced dead Tuesday. “A victim was located who had been shot multiple times,” Brookline police Deputy Superintendent Paul Campbell said. Neighbors described hearing a burst of shots and then sirens, followed by a heavy police presence that lasted into the early morning hours. Detectives returned Tuesday to speak with residents, search for surveillance footage and mark potential evidence along the sidewalk and entryway.
Officials identified the victim Tuesday as Loureiro, a physicist originally from Portugal who joined MIT’s faculty in 2016 and was named director of the university’s fusion center in 2024. He led research groups focused on plasma turbulence and magnetic reconnection and oversaw hundreds of researchers working on fusion energy projects. The Norfolk County district attorney’s office said the shooting remains an active homicide investigation. Authorities did not publicly discuss a motive or say whether the attacker knew the victim. Police said preliminary review shows no link between the Brookline shooting and a separate recent shooting in Rhode Island. Investigators urged residents with cameras to share recordings from Monday evening as they reconstructed Loureiro’s final movements.
Loureiro’s killing shook MIT’s campus in Cambridge, where flags were lowered and colleagues held informal gatherings to remember a respected mentor. University leaders described him as a generous collaborator who brought international experience from prior work in Lisbon, London and U.S. laboratories. Students who worked in his group said he set high standards but was patient in the lab, often staying late to review code or experiment plans. In Brookline, a small memorial of candles and flowers grew outside his building Tuesday night as residents traded updates and asked whether the gunfire was random. Crime statistics show the town reports relatively few homicides in a typical year compared with Boston, making Monday’s shooting an outlier for the neighborhood near Boston University’s campus.
Detectives were processing ballistics and digital evidence, including doorbell footage, transit camera video and phone records, according to officials familiar with the search. The Norfolk County district attorney, Michael W. Morrissey, said investigators are following leads and will release updates when doing so will not compromise the case. Brookline police said patrols were stepped up in the area while officers went door to door seeking witnesses who might have seen a person leaving Gibbs Street around the time of the shooting. The Massachusetts State Police Crime Scene Services Section assisted with mapping the scene, and the medical examiner will determine the official cause and manner of death.
Public records show Loureiro, 47, earned advanced degrees in physics and worked at research centers in Portugal and the United Kingdom before moving to Massachusetts. He became a U.S.-based leader in plasma physics and served on international collaborations aimed at advancing fusion energy. His appointment to lead MIT’s Plasma Science and Fusion Center last year came as private and public groups invested heavily in fusion research across New England. The Brookline address where he was shot is about two blocks from the Green Line’s Packard’s Corner stop, in a corridor of apartment buildings and small businesses straddling the Boston-Brookline line.
Authorities said the next formal update would come as soon as detectives could share verified information about potential suspects or vehicles. If a suspect is identified, police could seek an arrest warrant through the Brookline District Court or, depending on charging decisions, bring the case to a Norfolk County grand jury. The district attorney’s office said there were no public court filings as of Wednesday. Autopsy findings are expected in the coming days. University officials are organizing a campus remembrance, and neighbors said they plan a candlelight vigil this week.
On Gibbs Street Tuesday night, residents stood in clusters near a taped-off stoop, swapping stories about a neighbor who often carried a backpack and hurried to early meetings in Cambridge. “He was quiet and kind,” said Deborah Lin, who lives across the hall and said she last saw Loureiro taking out trash over the weekend. A graduate student who asked to be identified only as Mark said the building’s hallway was packed with officers Monday night. “Everyone’s shaken,” he said, pointing to a row of candles flickering in a first-floor window. Outside MIT’s plasma lab on Albany Street, a handwritten note read, “For Nuno — teacher, leader, friend.”
As of Wednesday afternoon, police had not named a suspect or announced any arrests. Investigators planned to continue canvassing and reviewing video through the week, with the next update expected after preliminary autopsy results and additional interviews are complete.
Author note: Last updated December 17, 2025.