In the moments after a Minnesota police officer fatally shot Philando Castile, his handcuffed girlfriend began screaming in the back of a patrol car as her 4-year-old daughter begged her to stop.

The Minnesota police officer who pulled over Philando Castile politely told the driver that his brake lights were out and calmly instructed him not to pull out his handgun before suddenly drawing his own weapon and firing seven rounds into the car, a video released Tuesday showed.

The final moments before Philando Castile was killed by a police officer during a traffic stop in suburban St. Paul revolved around a gun he was licensed to carry and trained to use safely.