The gunman who killed at least four people and himself at a Midtown Manhattan office tower was targeting the National Football League, but ended up on Rudin Management’s floor by mistake, two senior law enforcement officers said.   

Instead of going to the NFL’s fifth-story office at 345 Park Ave., he picked the wrong elevator bank that took him to Rudin’s office on the 33rd floor, the officers said. That’s where the body of the shooter, believed to be Shane Tamura, a 27-year-old who last resided in Las Vegas, was found.   

A manifesto and notes found on him indicated a fixation with Chronic Traumatic Encephalopathy, or CTE, caused by head trauma, the officers said. His social media feed showed his football career ended after a head injury, and he wrote that the NFL didn’t do enough for CTE.   

The gunman has a documented history of mental-health troubles, drove across the country before entering New York City earlier Monday, Police Commissioner Jessica Tisch said.   

The tower also houses the headquarters of Blackstone Inc., where an employee was among those killed, according to a person briefed on the matter.   

Bloomberg's John Tucker has the details in this two-minute report.

The gunman who killed at least four people and himself at a Midtown Manhattan office tower was targeting the National Football League, but ended up on Rudin Management&rsquo;s floor by mistake, two senior law enforcement officers said.&nbsp; &nbsp; Instead of going to the NFL&rsquo;s fifth-story office at 345 Park Ave., he picked the wrong elevator bank that took him to Rudin&rsquo;s office on the 33rd floor, the officers said. That&rsquo;s where the body of the shooter, believed to be Shane Tamura, a 27-year-old who last resided in Las Vegas, was found.&nbsp; &nbsp; A manifesto and notes found on him indicated a fixation with Chronic Traumatic Encephalopathy, or CTE, caused by head trauma, the officers said. His social media feed showed his football career ended after a head injury, and he wrote that the NFL didn&rsquo;t do enough for CTE.&nbsp; &nbsp; The gunman has a documented history of mental-health troubles, drove across the country before entering New York City earlier Monday, Police Commissioner Jessica Tisch said.&nbsp; &nbsp; The tower also houses the headquarters of Blackstone Inc., where an employee was among those killed, according to a person briefed on the matter.&nbsp; &nbsp; Bloomberg's John Tucker has the details in this two-minute report.

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Listen for today's top stories, with context, in just 15 minutes. Each morning, hosts Nathan Hager and Karen Moskow bring you the latest headlines on US politics, foreign relations, financial markets and global economics. The show is recorded at 5AM ET each weekday, so you get the freshest reporting on the stories that matter. Get informed from Bloomberg's 3,000 journalists and analysts. Listen and subscribe to Bloomberg Daybreak: US Edition.

Bloomberg Daybreak: US Edition

Deadly New York Shooting: All the Details in Two Minutes

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