A Brown University custodian said he saw the alleged campus shooter who opened fired in a classroom earlier this month nearly a dozen times a few weeks before the attack — and shared his suspicions with an on-campus security guard, the Boston Globe reported.

“Derek Lisi, who has worked at Brown for 15 years, said he had taken note of a man pacing the hallways, peering into classrooms, and ducking into a bathroom to avoid being seen,” the Globe reported Dec. 22.

“…Twice, Lisi said, he told a campus security guard about a suspicious person in the engineering and physics building.”

The news came as Brown University’s head of public safety was put on administrative leave amid a campus review of the Dec. 13 shooting that left two students dead and nine injured.

“A thorough After-Action Review is an essential part of any recovery and response following a mass casualty event like the one that has devastated our campus. A review like this is standard. As it takes place, Vice President for Public Safety and Emergency Management Rodney Chatman is on leave, effective immediately,” Brown University President Christina Paxson stated in a memo to the campus community.

Meanwhile, the U.S. Department of Education has launched its own review of the shooting as well.

The department’s Office of Federal Student Aid will investigate if Brown violated the Jeanne Clery Campus Safety Act, “which requires institutions of higher education to meet certain campus safety and security-related requirements as a condition of receiving federal student aid,” officials announced in a news release.

“In the hours after the shooting, public reporting appeared to show that Brown’s campus surveillance and security system may not have been up to appropriate standards, allowing the suspect to flee while the university seemed unable to provide helpful information about the profile of the alleged assassin,” the department stated.

“Additionally, many Brown students and staff reported that the university’s emergency notifications about the active shooter were delayed, raising significant concerns about their safety alert system. If true, these shortcomings constitute serious breaches of Brown’s responsibilities under federal law.”

Paxson, in her announcement, said the Ivy League Institution launched new security measures ahead of the spring 2026 semester. Among them, officials will install security cameras in the campus building in which the shooting took place.

A larger police presence and additional key card access points are also on tap, as well as the installation of panic alarms.

“We will also initiate an external comprehensive Campus Safety and Security Assessment of the Brown campus, including College Hill and the Jewelry District, to review Brown’s current safety and security policies, procedures, infrastructure and training,” Paxson stated.

She also noted that all but two students injured in the shooting have been discharged from the hospital.

Brown University’s board of trustees has yet to weigh in on the tragedy, prompting some criticism, Fox News reported.

“Brown University’s board of trustees, which features a top bank CEO, billionaires, hedge fund and banking leaders, authors, professors, actresses and scientists, has remained silent after the campus murders that took place earlier this month,” the outlet reported.

“While the primary duty of the board is to uphold the fiduciary duty of the Ivy League university and does not oversee day-to-day operations, the group is the highest governing body of the school, is responsible for appointing and evaluating the president of the college and approves strategic long-term strategy and planning for the top college.”

Several lawsuits are expected to be filed over the shooting, observers say.

The motive for the attack remains unclear, as the suspected gunman killed himself, but he has been described as an “angry genius.”

The suspect, Claudio Manuel Neves Valente, also allegedly killed MIT Professor Gomes Loureiro, an academic colleague.

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