The Nevada man who opened fire inside a Manhattan skyscraper and killed four people, including a New York City officer, was the son of a retired officer with the Los Angeles Police Department, multiple law enforcement sources tell NBC Los Angeles Tuesday. The sources said Shane Devon Tamura’s father, Terence Tamura, served 27 years at the LAPD.

The gunman who killed four people, including a New York City police officer, during a shooting Monday inside a Manhattan skyscraper once refused to leave a Las Vegas casino, leading to his arrest, the 8 News Now Investigators have learned.

NYC is mourning NYPD Officer Didarul Islam and three other people killed in Monday's shooting inside an office at 345 Park Avenue.

Despite record seizures and restrictive laws, New York City has struggled to stem the tide of untraceable firearms.

Gabriel Alvarez, 22, of Goldbach Drive in Stratford, died of injuries sustained in the shooting in the Bronx, the New York City Police Department said in a news release Tuesday. Officers responded to a 911 call of two males shot in the 500 block of Brush Avenue at 6 a.m., police said, noting the scene falls within the confines of the 45th Precinct.

NYC gunman Shane Tamura is seen on video talking about his high school football career in California after a game in September 2015.

Political commentator Bill O’Reilly said Monday night that New York City residents are “very uneasy” in light of the skyscraper shooting in Midtown, where four people were killed, including a New York City Police Department (NYPD) officer.

Plus, some Republican lawmakers are pushing for legislation to end "weather modification," pushing a fringe theory that humans are controlling the weather into the mainstream.