Daily Progress reports that the cause of the helicopter crash is not yet clear.
Rosenthal affirmed the crash on Twitter. In addition to the deaths of the troopers and one other identified person, at least 34 people were injured in the vehicle ramming and other violence.
Saturday's rally was the most recent occasion drawing white patriots and conservative activists from the nation over to this Democratic-voting town - an improvement accelerated by the city's choice to expel images of its Confederate past.
Cullen was a lieutenant who graduated from the Virginia State Police Academy in May 1994 as a member of the 90th Basic Session, according to a press release.
Noll said he watched helplessly as the Bell 407 helicopter dropped vertically tail down. He first joined the Virginia State Police Aviation Unit in 1999.
Cullen is survived by his wife and two sons.
They had taken off from Charlottesville Airport on their final sortie of the day at around 4 p.m. Cullen was a 20-year veteran of the police force and a 14-year member of the aviation unit and was a CFII in fixed- and rotary-wing aircraft.
Before the fatal crash, the troopers were helping law enforcement officers monitor the nationalist rally in the area.
Trooper-Pilot Bates would have turned 41 years old Sunday, Aug. 13.
This is a devastating loss for their families, the Virginia State Police, and the entire Commonwealth.
The horrific helicopter crash occurred a few hours after a speeding Dodge Challenger accelerated and slammed into two other cars that hit dozens of counter-protesters.