Kellner said family of the victims had been dropped off at the crash site in a private helicopter and were already at the scene when investigators arrived. The helicopter crashed a short distance from the Bylers' ranch, Kellner said.
One of the news reports says the crash happened about 10 mins after take off.
The refueller in the video indicated he refuelled the aircraft around 12:30 before it was flown to the ranch - if the pilot hadn't had adequate rest in the afternoon (possibly becaause he attended the wedding as a family friend) it adds to the fatigue and disorientation idea.