Newly released video is providing a closer look at the law enforcement response to Wednesday's deadly shooting at a Citibank corporate campus

Newly released video is providing a closer look at the law enforcement response to Wednesday's deadly shooting at a Citibank corporate campus in Florida, where a security guard was hailed as a hero after confronting and killing an armed gunman who fatally shot an employee and injured four others. Hillsborough County Sheriff Chad Chronister praised security guard John Fraley for stopping the attacker, saying his actions prevented further loss of life. The gunman, identified as Jacob Pearson, 35, of Orlando, stormed the Citibank complex near Interstate 75 and Dr. Martin Luther King Jr. Boulevard shortly after noon Wednesday.