Police are still working to understand what prompted a 27-year-old Nevada man to open fire ata midtown Manhattan skyscraper, killing at least four people before fatally shooting himself. Toting a rifle, Shane Tamura walked into the lobby of 345 Park Ave., an office building that houses theNFL headquartersand major financial firms, on the evening of July 28, and "immediately" began shooting, New York City Police Commissioner Jessica Tisch said at a news conference. One of the victims was a 36-year-oldNew York City Police Officer named Didarul Islam. Tisch said the suspect had documented mental health issues. Authorities believe he acted alone. Tamura left a note that appeared to blame the NFL for a brain injury, New York City Mayor Eric Adams said during a July 29 appearance on CBS. Here's what we know so far about the suspect. Surveillance footage showed Tamura exiting a double-parked black BMW outside of the Manhattan skyscraper. He then entered the lobby, turned right and began shooting. The vehicle was registered under Tamura's name in Nevada, Tisch said. Police discovered the vehicle had traveled across the country, through Colorado on July 26, and through Nebraska and Iowa on July 27, Tish said. They tracked the vehicle in Columbia, New Jersey, a city about 70 miles west of New York City, at 4:24 p.m. on July 28, hours before the shooting. Inside the vehicle, officers found a rifle case with rounds, a loaded revolver, ammunition, magazines and a backpack with medication prescribed to Tamura. The authorities hadn't flagged Tamura as a threat before the shooting, Adams told CNN. Officials said Tamura shot New York City Police Officer Didarul Islam and several others after he entered the Park Avenue building. As Tamura entered an elevator, he appeared to spare the life of a woman exiting the building, Adams said during an interview on CNN. The gunman then went to the 33rd floor, occupied by the building's owner, Rudin Management, and fired several rounds. One person was shot and killed. Tamura then took his own life, Tisch said. Public records show Shane Devon Tamura wasissued a work cardby the Private Investigators Licensing Board in Nevada, which regulates security guards and private investigators in the state. The card was active between December 2019 and December 2024. The card did not authorize him to carry a firearm. Preliminary investigations indicate the gunman intended to get to the NFL headquarters, but may have taken the wrong elevator, according to Adams. "That is where he carried out additional shootings and took the lives of additional employees," Adams said during his CBS interview. Tamura, who shot himself in the chest, left behind a three-page note that said he had chronic traumatic encephalopathy, or CTE, police said. CTE is a brain condition experienced by people who have repeated blows to the head, often through contact sports such as football. The condition can result in a variety of symptoms, including increased aggression, emotional instability and suicidal thoughts and behavior, according to the Mayo Clinic. He asked in the note for his brain to be studied and claimed the NFL "knowingly concealed the dangers to our brains to maximize profits. They failed us." Tamura said football gave him CTE in the letter and alleged the disease caused him to "drink a gallon of antifreeze," according to police. Officials are still figuring out the next steps for examining Tamura's body, Adams told CNN. He said the city's medical examiner would determine how to handle the suspect's brain. Tamura attended high school in Southern California, where he wasa star football player. Dan Kelley, a coach at Golden Valley High School, where Tamura played for three seasons before transferring to Granada Hills,told the Los Angeles Timesonly that he remembered Tamura as "a good athlete." An online video circulating from 2015 shows Tamura speaking after a game during his senior year at Granada Hills Charter School in Los Angeles. "We definitely had to stay disciplined," Tamura says in response to a question about the game. "Our coach kept saying, 'Don't hold your head down, don't hold your heads down.' We just had to stay disciplined and come together as a team." The school said in a statement provided to USA TODAY July 29 that Tamura attended for the 2015 Fall semester but he "has had no connection with the school since his withdrawal a decade ago." "We are horrified by the violence in New York. It is heartbreaking, and we extend our deepest sympathies to the victims, their families, and affected communities," the statement said. This is a developing story. Eduardo Cuevas and Scooby Axson contributed to this report. This article originally appeared on USA TODAY:Who was Shane Tamura? What we know about the NYC shooting suspect
