In a video the plane piloted by Mr Viljoen, 38, is seen shortly before the crash at sunset on Saturday flying low and fast towards the building.
According to News24, earlier that day the now deceased pilot was an uninvited guest at a private function at the club.
"Matsieng Flying Club members sensed that the pilot might have had an ulterior motive at the time and ordered an immediate evacuation of the club premises by the approximately 50 attendees".
The club said there were no other injuries and that emergency services from the Kgatleng District Council were on the scene within minutes.
WARNING: Graphic content and strong language. A short time later, the aircraft flew along one of the runways at an extremely low altitude and crashed into the clubhouse.
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Chris Briers of Matsieng Botswana alleged that the Kalahari Air Services pilot committed suicide in this spectacular fashion, as he was at a party, and allegedly got drunk and into a fight with his wife. These response actions are to be commended.
He then made a decision to crash the plane into a building where the wife was attending a baby shower.
The pilot was said to have been chased out of the clubhouse after having an argument which led to a physical fracas with his wife at the clubhouse where they were having a baby shower. He was pronounced dead at a local hospital.
"He phoned his one mate on the ground who was still at the party and he wanted to know where his wife was".
The website Aviation Safety identified the plane involved in the incident as a Beechcraft B200 Super King Air.
TimesLIVE is aware of the name of the pilot but there has been no official confirmation of his identity by police in Botswana. Then the plane crashed into it.