Graphic Warning: This story contains graphic topics that may be disturbing. Discretion is advised.
(NewsNation) — The man who fatally shot four people in a high-rise office building in Manhattan before turning the gun on himself was targeting the headquarters of the National Football League, New York City Mayor Eric Adams said Tuesday.
Investigators believe 27-year-old Shane Tamura mistakenly took the wrong elevator, leading him to Rudin Management instead, Adams told NewsNation local affiliate WPIX.
Tamura reportedly had a three-page suicide note inside his pocket, which claimed he had a brain injury from a contact sport and blamed the NFL. Tamura, who played high school football, reportedly wanted his brain studied after his death. An official motive has not yet been released.
Police also said on Tuesday that they would be questioning a man they say supplied parts used to assemble the gun in the shooting.
3 New York shooting victims identified
On Tuesday, investment management company Blackstone confirmed executive Wesley LePatner was killed in the shooting. LePatner’s colleagues described her as “brilliant, passionate, warm, generous, and deeply respected within our firm.”
Officer Didarul Islam, 36, was a veteran of the New York Police Department for more than three years. He left behind a wife — who is eight months pregnant — and two young sons, according to New York Gov. Kathy Hochul.
“My heart is with his loved ones, his NYPD family and every victim of this tragedy,” she said in a statement.
Aland Etienne, a security guard at the building, was identified as a victim by the president of the New York City branch of the Service Employees International Union.
“We extend our deep condolences to the families and friends who lost loved ones tonight, including that of our own 32BJ SEIU security member Aland Etienne, a dedicated security officer who took his job duties extremely seriously,” SEIU President Manny Pastreich said in a statement.
NFL employee ‘seriously injured’ during NYC shooting
An NFL employee was among those shot at a Manhattan office building Monday, the league’s commissioner said in a letter to employees obtained by NewsNation.
“One of our employees was seriously injured in this attack. He is currently in the hospital and in stable condition. NFL staff are at the hospital and we are supporting his family,” the letter reads.
“We believe that all of our employees are otherwise safe and accounted for,” it continued.
New York Police Department officers respond to the scene of a shooting at 345 Park Ave. in New York on July 28, 2025. (Victor J. Blue/Bloomberg via Getty Images) 
New York Police Department officers secure the scene of a shooting from Monday in New York on July 29, 2025. (Victor J. Blue/Bloomberg via Getty Images) 
New York State Police troopers gather on 52nd Street outside a Manhattan office building where two people were shot, including a New York police officer July 28, 2025, in New York. (AP Photo/Angelina Katsanis) 
Pedestrians walk by police tape on the corner of Lexington Avenue and 53rd Street, near a Manhattan office building after a shooting on July 28, 2025, in New York. (AP Photo/Angelina Katsanis) 
Police work at the scene on the corner of Lexington Avenue and 53rd Street, near a Manhattan office building after a shooting July 28, 2025, in New York. (AP Photo/Angelina Katsanis) 
New York Police Department officers arrive on the corner of Lexington Avenue and 53rd Street, near a Manhattan office building after a shooting July 28, 2025, in New York. (AP Photo/Angelina Katsanis) 
A New York police officer stands watch on 52nd Street outside a Manhattan office building where at least two people were shot, including a police officer July 28, 2025, in New York. (AP Photo/Angelina Katsanis)
Manhattan office building shooting: What happened
Tamura was seen on surveillance footage getting out of a black BMW and carrying an M4 rifle. He then walked into 345 Park Avenue — a 44-story building housing financial firms, the NFL and more — and immediately shot an NYPD officer, police said.
He then reportedly shot a woman trying to hide behind a pillar in the lobby, a guard behind the security desk and another man.
Officials said Tamura allowed a different woman to walk out of an elevator and into the lobby without injuring her. He then went up to the 33rd floor, Rudin Management’s office, and fired multiple rounds as he walked through the room, killing another person on that floor, officials said.
He then went down a hallway and shot himself in the chest, the NYPD said.
Tamura drove from Nevada to New York to commit the crime, the Associated Press reported.
“New York has some of the strongest gun laws in the nation. We banned assault weapons. We strengthened our Red Flag Law. We closed dangerous loopholes,” Hochul said. “But our laws only go so far when an AR-15 can be obtained in a state with weak gun laws and brought into New York to commit mass murder.
A member of the Rudin family, which owns the building where the shooting took place, told NewsNation, “The Rudin family and everyone at our company are devastated by yesterday’s senseless tragedy.”
“Our thoughts and prayers are with those injured and lost last night, including our cherished Rudin colleague, a brave New York City police officer, a beloved lobby security guard and an employee at a tenant firm…As New Yorkers, we stand shoulder to shoulder in the face of this hatred, we grieve with the families and loved ones of those lost, and we pray for the full recovery of those injured.”
NewsNation’s Patrick Djordjevic, Diana Falzone and Brittney Donovan contributed to this report.