(NEW YORK) — New details about how police caught up to Claudio Manuel Neves Valente, the 48-year-old former Brown University graduate student who allegedly perpetrated a mass shooting at Brown and killed a Massachusetts Institute of Technology professor, have emerged after a dayslong manhunt where officials said he made a series of moves designed to evade authorities.
Authorities credited the work of a tipster who they say “blew this case out in the open.”
Providence Police Chief Oscar Perez said local police helped track down Neves Valente, who was found dead in a New Hampshire storage unit on Thursday, in part thanks to surveillance video and a tip from an anonymous source that pointed authorities to a post on social media platform Reddit.
The tip referenced a post in which the Reddit user — later identified as John — called for police to “look into a grey Nissan with Florida plates,” according to the affidavit.
“I’m being dead serious,” the Reddit post read. “That was the car he was driving.”
After noticing the man they believed to be John interacting with the suspect on surveillance footage, police released images of him and asked for help in identifying him on Wednesday. Later that day, John approached a Providence police officer and said he was the person they were looking for.
John told detectives that he encountered the suspect in the bathroom of Brown University’s Barus & Holley building in the hours before Dec. 13 shooting and was suspicious, according to the affidavit.
John followed Neves Valente outside, where he said he observed the suspect approaching his car, the affidavit noted. The suspect and John would lock eyes as Neves Valente repeatedly walked around the block, in what John would describe “as a game of cat and mouse,” according to the affidavit.
“At some point they [John and Neves Valente] encountered each other on George Street, at which time, the Suspect ran in the opposite direction. John then ran up behind the person of interest, slowed to a good speed-walk and walked past the Suspect,” the affidavit said.
Ultimately, John questioned Neves Valente why he was circling the block prompting a response from the suspect, before John walked away, according to the affidavit.
Rhode Island Attorney General Peter Neronha told reporters John’s information was crucial in tracking the suspect.
“I remember last night watching his interview, and he blew this case right open,” he said.
The tip and surveillance video, along with the use of license-plate reader technology, led investigators to a car rental agency in Massachusetts.
There, police obtained a copy of the rental agreement with the suspect’s name, as well as video of the suspect that matched the videos of the person of interest seen on the Brown University campus on the day of the shooting, the complaint said.
That discovery ultimately led investigators to a storage facility in Salem, New Hampshire, where the suspect was found dead, officials said.
Financial records and video evidence confirmed that the storage unit belonged to the alleged suspect and that the rental vehicle was connected to both the Rhode Island and Massachusetts cases.
Authorities identified the suspect as Neves Valente, a Portuguese national and former Brown University student whose last known address was in Miami, Florida. Officials said Neves Valente died by suicide Thursday evening.
Officials confirmed that Neves Valente was found with a satchel containing two firearms, and evidence recovered from the vehicle matched what was found at the Providence crime scene.
Federal authorities confirmed that shortly before 9 p.m. on Thursday, FBI SWAT teams executed court-authorized search warrants at a storage facility in Salem, which is where they found Neves Valente’s body.
The autopsy performed by the New Hampshire Department of Justice Office of the Chief Medical Examiner estimated that Neves Valente died on Tuesday, one day after the professor was killed at MIT, according to investigators.
Portugal’s Instituto Superior Técnico (IST) confirmed to ABC News that Cláudio Manuel Neves Neves Valente studied between 1995 and 2000 in the school’s physics engineering program, the same one attended at the time by slain MIT professor Nuno F.G. Loureiro.
A 1998 announcement in Portugal’s official Diario da República referred to Neves Valente’s appointment as a teaching assistant at IST and a 2000 notice in the same publication mentions his termination from the role.
A spokesperson for IST declined to comment further on Neves Valente’s history at the institution, due to the ongoing investigation and out of respect for the friends and family of Loureiro.
Brown officials confirmed that Neves Valente was enrolled at the university from the fall of 2000 through the spring of 2001 as a graduate student in physics, entering Brown’s graduate program in September 2000 before taking a leave of absence in April 2001 and formally withdrawing in 2003.
“He was not a current student, was not an employee and did not receive a degree from the University, attending for only three semesters as a graduate student until taking a leave in 2001 and formally withdrawing effective July 31, 2003,” Brown University President Christina Paxson wrote in a letter to students and faculty Thursday.
During his time at Brown, he was enrolled only in physics courses, which were typically held in the Barus & Holley building. University records indicate he has had no active affiliation with Brown for more than two decades.
Police said the suspect acted alone and that there is no indication, at this time, of additional planned attacks. Investigators have not identified any writings, known criminal history or clear motive.
Officials said forensic teams are still processing evidence recovered in New Hampshire, including firearms, and will compare it with ballistic and DNA evidence from the Providence crime scene.
Paxson said the university is still reviewing how the suspect gained access to the building. She said the building was unlocked that day because exams were being held, and the university will examine security procedures moving forward.
Investigators said Neves Valente obtained lawful permanency in April 2017 and was issued a green card.
Secretary of Homeland Security Kristi Noem said in an X post that Neves Valente received his visa through the diversity visa lottery program, and announced that, at President Donald Trump’s direction, she was pausing the program.
Each year, the State Department awards up to 50,000 immigrant visas to “winners” of the diversity visa lottery. The program was created by Congress in 1990 to allow applicants from countries with low rates of immigration into the U.S. to come here.
The winners are selected at random, but they must still go through a lengthy application process, which includes submitting criminal records, being interviewed at an embassy or consulate, and meeting other requirements, such as having a High School Diploma or two years of work experience. Applicants are then allowed to apply for lawful permanent resident status.
Investigators said they identified Neves Valente by name late Wednesday night and weighed whether releasing his identity could cause him to flee or take further action.
Officials said they believed he might return the rental car in Boston or attempt to leave the area, and they wanted the opportunity to arrest him without alerting him that police were closing in.
Officials said it remains unclear exactly when the suspect took his own life, but noted that he signed into the storage facility but was never seen leaving.
The site was secured by federal agents, and investigators said an autopsy will help determine the timing of his death.
ABC News’ Armando Garcia and Christopher Looft contributed to this report.
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