Three days after the deadly shooting at Brown University, officers received an anonymous tip that stuck out from a flood of information. It directed the authorities to a post on Reddit.
“I’m being dead serious. The police need to look into a grey Nissan with Florida plates, possibly a rental,” the Reddit user posted, according to an affidavit filed by the police in Providence. R.I.
That tip would later lead to a breakthrough in not only the search for the campus attacker but also the suspect in the murder of a professor at the Massachusetts Institute of Technology. It also ended the dayslong manhunt that had put both the Brown and M.I.T. communities on edge.
A day after the Reddit post was made, the writer approached law enforcement officials and told them about his encounter with a suspicious man in Brown University’s Barus and Holley building.
The information “blew this case right open,” Attorney General Peter F. Neronha of Rhode Island said in a news conference Thursday.
The tipster, whom the police referred to only as John, said that he had encountered the suspect inside a bathroom on the ground floor of the building between 1:45 p.m. and 2 p.m., around two hours before the first shots were reported. John said the suspect’s clothing was inappropriate for the weather and that they had made eye contact.
John told the police that he followed the man after he left the building to a Nissan vehicle with a Florida plate. But instead of entering the vehicle, the suspect started walking around the block, with John behind him. John said it was like “a game of cat and mouse.”
At one point, the two men spoke. According to the affidavit, John asked the suspect, “Your car is back there, why are you circling the block?” To which the suspect responded, “Why are you harassing me?” John went his own way soon after that.
When the police showed John images of the suspect’s car from safety cameras, he said: “That might be it.”
It was the breakthrough the authorities had been looking for.
The suspect’s vehicle was a key detail in the investigation. A Brown University faculty member had also described a suspicious vehicle in the same neighborhood, a gray sedan with Florida plates. It did not take long for investigators to find that the car was rented from Alamo Rent a Car in downtown Boston.
And from the rental agreement, they got a name: Claudio Manuel Neves Valente.
Then came more information about the suspect: He was a Portuguese national. Brown University said he was a former student, enrolled from the fall of 2000 through the 2001 spring semester. He was there for a Ph.D. in physics, but withdrew from that program in 2003.
Travel records showed that years later, in 2017, Mr. Neves Valente returned to the United States as a legal permanent resident.
At this point, the investigations into the Brown University shooting and the murder three days later of Nuno F.G. Loureiro, a professor at M.I.T., appeared to converge.
Through surveillance footage, investigators tracked the gray Nissan to near Dr. Loureiro’s home. They also determined that the suspect drove that car to a storage unit in Salem, N.H., where they found the body of Mr. Neves Valente, with a self-inflicted gunshot wound, on Thursday night.
The investigators now also knew that Mr. Neves Valente had rented hotel rooms in Boston, as well as that storage unit. And according to Leah B. Foley, the U.S. attorney for the District of Massachusetts, Mr. Neves Valente and Dr. Loureiro had attended the same academic program in Portugal from 1995 to 2000.
At some point after the shooting at Brown, the plates on the suspect’s car were changed from Florida to Maine, Ms. Foley added.
The suspect’s motives in both attacks remain under investigation.
“I think there’s a lot of unknowns,” said Mr. Neronha, the attorney general of Rhode Island. “In terms of why Brown? I think that’s a mystery.”
Ashley Ahn covers breaking news for The Times from New York.
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