Westner, as reported on his website, was the inventor of golf training machine Instant Golfer.
Reports in local media said the former world number 40 had taken his wife hostage at their residence on South Africa's east coast, just south of Durban.
Stunning and tragic news emerged from South Africa on Wednesday morning as former pro golfer Wayne Westner was found shot dead on the Kwa-Zulu Natal Coast. Some 1,100 students received lessons there.
One source, who spoke on condition of anonymity, said that Westner was in the process of relocating to Gauteng.
"I was in Celbridge for about nine years and came home in 2006", he said. So I made the decision to go back home and it's great.
Next chance of rain Monday, Tuesday
Partly sunny skies Wednesday will continue through the weekend, but it will be colder as arctic air move in through the weekend. Sunday will remain partly to mostly cloudy with a few passing showers or thunderstorms possible anytime.
Renowned Sky Sports commentator Ewen Murray, hinted at the "demons" Westner had to deal with, writing: WayneWestner;tormented golfing genius.Brilliant player with demons.Sad end for a more than decent colleague.
Westner won 14 professional events in his career, including two on the European Tour and the South African Open in 1988 and 1991, as well as the 1996 World Cup of Golf with Ernie Es.
"Sad day, our friend Wayne Westner passed today".
"Great memories thank you my friend".
Lieutenant Colonel Thilani Zwane, a spokesperson for the South African Police Service, confirmed the deceased was the 55-year-old golfer, who was forced to retire in 1998 after suffering an ankle ligament injury, adding that an inquest has been opened to look into the death.