MONETA, Va. — The fatal shooting of a reporter and cameraman unfolded on live TV during the early morning show, as tens of thousands of viewers watched a horrified anchor struggle to comprehend what had happened.

Within hours, the carefully scripted carnage carried out by a disgruntled former colleague spread to millions of viewers gripped by what had transformed into a social media storm. The governor initially described a car chase on his weekly radio show, with police on the shooter’s tail on an interstate highway.

Then, social media posts referencing the slain TV pair surfaced on an account under an on-air pseudonym used by the gunman — culminating with a first-person video of the ambush filmed by the shooter.

The 56-second clip shows Vester Lee Flanagan II quietly approach WDBJ reporter Alison Parker and cameraman Adam Ward, gun in hand, as they conduct an interview. But Ward’s camera was aimed at the mini-golf course nearby instead of the reporter. So the shooter waited, cursing Parker under his breath, for 20 seconds until the live television picture was back on the reporter. Then he fired eight shots without saying a word.

The attack seemed carefully planned. Flanagan was captured in a rental car he reserved at some point before the shootings; his own Mustang was found abandoned at the local airport, Franklin County Sheriff Bill Overton said. The interview was done at a shopping center not yet open for the day at a remote lake in Moneta, some 25 miles away from WDBJ’s studios in Roanoke. The station promoted where the reporter would be, including a plug on Twitter just a half hour before the shooting.