Shane Devon Tamura, who killed 4 people and injured many others in New York City on July 28, 2025. Credit :

Supplied; CCTV:Rudin-345ParkAvenue-Park Av/ZUMA Press Wire/Shutterstock

• Shane Tamura opened fire in the 345 Park Avenue offices on July 28
• He was a 27-year-old man living in Las Vegas who drove to the New York City office
• Tamura fatally shot at least four people in the building

Shane Devon Tamura was identified as the gunman who killed at least four people inside a New York City office building on July 28.

Tamura, who was a 27-year-old former football player from Las Vegas, opened fire upon entering 345 Park Avenue in Manhattan. He shot at least five people, with four people dying and one person leaving critically injured.

The N.Y.C. Police Commissioner Jessica S. Tisch confirmed in a press conference that Tamura drove from Las Vegas over a period of two days before parking his black car outside the office building. Surveillance video captured him walking inside the building with an M4 rifle in hand and shooting office goers, one off-duty police officer and a security guard before taking an elevator to the 33rd floor. Upon entering the floor, which houses Rudin Management, he fired more rounds before he walked down a hallway and shot himself in the chest.

“We believe this to be a lone shooter and there is no active threat to the public,” Tisch said during the press conference.

An exact motive for Tamura’s crime is unknown. However, law enforcement officials later confirmed to PEOPLE that he had a suicide note on his body claiming that he suffered from chronic traumatic encephalopathy (CTE). He also named the National Football League (NFL), whose offices reside in that building, in the note. The Blackstone Group, KPMG, Deutsche Bank and Capital Trust are also among the companies housed in 345 Park Avenue.

Here’s everything to know about Shane Tamura, the man who killed at least four people inside a N.Y.C. office building on July 28.

People exiting 345 Park Avenue after a mass shooting in New York City on July 28. Kyle Mazza/Anadolu via Getty

Tamura was a 27-year-old man living in Las Vegas. Before committing his mass murder, he had worked as a security guard at a casino in Las Vegas, according to the New York Post.

A photo showing his concealed firearms permit from Las Vegas was also obtained by several news outlets.

Tamura appears to have kept a low profile online, but his former high school friend Caleb Clarke told NBC News that Tamura had transferred from a high school in Santa Clarita, Calif., to Granada Hills Charter High School in Los Angeles in 2015.

“You never would have thought violence was something you’d associate with him,” Clarke told the outlet. “You know, he could make a joke about people, but that’s just typical. Shane was a jokester. Everything he said was a joke. He had a ton of energy.”

Another one of Tamura’s former Granada Hills friends, Anthony Michael Leon, told NBC News that he found the news “shocking.”

“I’m telling you, this was one of those kids who never exerted bad energy or a negative attitude,” Leon recalled. “He was quiet, but when he did actually talk, people listened.”

Meanwhile, his former high school football coach, Walter Roby, said he was “blown away” by the heinous acts Tamura committed.

Shane Tamura entering 345 Park Avenue on July 28, 2025. CCTV:Rudin-345ParkAvenue-Park Av/ZUMA Press Wire/Shutterstock

Tamura was a high school athlete and was a running back at Granada Hills Charter High School. Clarke, who also played football with Tamura, recalled thinking that his teammate had potential to play in the NFL.

“I feel like it was definitely on the table for him,” Clarke said. “I don’t think he walked around to be like, ‘Oh, I’ll have NFL games one day.’ I think it was more of everybody just telling him how great he was … how special he was.”

Roby explained that Tamura was a “great player” who was “real elusive, real agile.” The coach added, “He came in, worked hard, kept his nose down. He was a quiet kid, well-mannered, very coachable. Whatever needed to be done, he would do.”

Shane Devon Tamura pictured.

N.Y.C. Police Commissioner Tisch shared in a late-night July 28 press conference that Tamura had a “documented mental health history.”

“According to our law enforcement partners in Las Vegas, Mr. Tamura has a documented mental health history,” Tisch said. “His motives are still under investigation.”

The commissioner didn’t elaborate on Tamura’s past mental health concerns, but he claimed in a suicide note that he suffered from CTE, which is a brain disease often associated with athletes who play football and other contact sports.

Law enforcement officials told PEOPLE that they recovered the note in his pocket, and that he mentioned both CTE and the NFL.

He wrote in the note, “Terry Long football gave me CTE and it caused me to drink a gallon of antifreeze,” and “You can’t go against the NFL, they’ll squash you.” Long was a professional football player who had CTE and died by suicide after drinking antifreeze in 2005.

“Study my brain please,” he also wrote, while adding, “I’m sorry.”

CTE is “a degenerative brain condition that happens after repeated head injuries” that “usually affects athletes who play contact sports or military personnel,” per the Cleveland Clinic. There is no current cure for CTE, and it can only be diagnosed posthumously.

“CTE permanently destroys nerve cells in your brain. This is called neurodegeneration. Over time, this damage can cause changes in your behavior and mental abilities,” the center explains.

N.Y.C. Mayor Eric Adams later claimed to PIX 11 that Tamura was trying to target the NFL offices but accidentally ended up on the 33rd floor at Rudin Management.

New York Police Department officers responding to the scene of a shooting at 345 Park Avenue. Victor J. Blue/Bloomberg via Getty

Tamura drove his black BMW from Las Vegas to N.Y.C. over a two-day period before entering Manhattan in the midst of rush hour the evening of July 28, Tisch explained. After double-parking his sedan on Park Avenue between 51st and 52nd Streets, he carried an M4 rifle and entered 345 Park Avenue.

Upon entering the office building, he opened fire and fatally shot off-duty police officer Didarul Islam. He then proceeded to shoot a woman hiding behind a pillar and continued firing rounds. After making it to a group of elevators, he shot a security guard who was hiding behind the security desk. A fourth man, an NFL employee, was shot in the lobby and was rushed to the hospital, where he remains in “stable condition,” NFL commissioner Roger Goodell said.

Tamura then entered an elevator in the lobby, and when a woman exited that same elevator, he allowed her to safely leave. The elevator took Tamura to Rudin Management on the 33rd floor, but it’s unclear if he intended to go there or if the elevator was already heading there.

After getting off on the 33rd floor, he walked around the office and fired shots at employees. He fatally shot his fourth victim on that floor. Tamura proceeded to walk down the hallway and then shot himself.

If you or someone you know is struggling with mental health challenges, emotional distress, substance use problems, or just needs to talk, call or text 988, or chat at 988lifeline.org 24/7.