A tragic mass shooting unfolded in Midtown Manhattan on Monday evening at 345 Park Avenue, leaving four people dead—including off-duty NYPD Officer Didarul Islam—and additional victims critically injured. The suspect, 27-year-old Shane Devon Tamura of Las Vegas, was later found dead by suicide on the 33rd floor according to NBC New York’s reporting and detailed in **AP News** coverage by AP News.
Investigators discovered a multi-page **suicide note** near Tamura’s body in which he attributed his actions to chronic traumatic encephalopathy (CTE)—a degenerative brain disease tied to repeated football injuries. The note explicitly mentioned the **NFL**’s culpability and requested his brain be examined after death to confirm CTE as the cause of his mental decline as first reported by the New York Post and echoed in the **Australian**’s coverage analysis by The Australian.
“He blamed football and CTE for ruining his life—and NFL for not doing enough.”
According to initial timelines, Tamura reportedly drove cross-country from Las Vegas, arriving in NYC just before 6:30 pm. He entered the building armed with an **M4 rifle**, opened fire in the lobby—killing Officer Islam and several others—then ascended to the 33rd floor before taking his own life Business Insider reconstructed the timeline and **The Daily Beast** highlighted key moments reporting on suspicious behavior.
Witnesses described chaos as employees barricaded themselves in offices. At least five others sustained minor injuries while fleeing the scene. The building houses prominent tenants, including **Blackstone**, the **NFL**, and **KPMG**, though authorities have not confirmed any specific link between Tamura and these organizations People Magazine confirmed the shooting details and **NBC New York** outlined business tenants as part of their building summary.
Officer Didarul Islam, who was completing off-duty private security work, was remembered as a hero—a 36-year-old NYPD veteran with a pregnant wife and two young children. **Mayor Eric Adams** called the act “violent, despicable,” and praised the NYPD’s response while calling for calm as CBS News covered and **AP News** reaffirmed
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“He spared one woman in the lobby—possibly offering insight into his mindset,” per sources.
A CNN anchor, quoted by Daily Beast, noted that Tamura spared a woman in the elevator lobby, which may help investigators understand whether the shooting was symbolic or premeditated in some selective way as the outlet highlighted.
Tamura’s note repeatedly accused football and the NFL of failing to address concussion risks and called out former high school athletes for living with trauma. He mirrored the tragedy of other former players who died from CTE-related issues. Tamura’s backstory includes high school football stints in California—and his mental health struggles reportedly worsened after sports-related injuries The Economic Times explored the personal arc and New York Post laid out the note’s language as part of its disclosure.
Authorities are continuing to investigate the precise motive and target. No clear link has been found between Tamura and the companies in the building. He had a concealed carry permit in Nevada and a clean criminal record—but officials underline his documented mental health issues and possible brain disease as critical to understanding the attack as reported in their coverage and AP News cited as part of motive review in arrest profiles.
This devastating shooting has reignited national conversations surrounding CTE, mental health in athletes, and workplace safety protocols. At least one NFL employee was seriously injured and hospitalized, prompting the league to release a statement—though the NFL has yet to address broader calls for reform inspired by the note’s contents according to reporting and People Magazine confirmed employee injury as mentioned earlier.
