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Two other men were also found dead on the course from apparent gunshot wounds.
Gene Siller, 41, was on the course on Saturday afternoon (3 July) when he decided to check on a white pick-up truck that had driven onto the 10th hole at Kennesaw's Pinetree Country Club.
As he headed over to see what had happened to the vehicle, a witness says they heard five gunshots in a row, after which Siller was dead.
It is believed a man drove the Ram 3500 truck onto the course, shot Siller dead, then made an escape.
The witness said: "Then nothing went on, and immediately members reacting like 'I think there might be gunshots' and then apparently somebody was down on the ground.
"Then it was kind of like a frenzy, everyone was trying to figure out what was going on."
Police later discovered Siller's body on the 10th green of the course.
The truck was also found on the 10th green, with two men in the bed that had also died from apparent gunshot wounds.
The Gwinnett Daily Post reports that Siller was a regular competitor in the Georgia PGA Section golf tournaments, and had been since 2007.
He had also been the assistant professional at St. Ives Country Club and worked at Summit Chase Golf Club before taking a role at Pinetree.
Georgia PGA released a statement that read: "Tragedy has stricken the Georgia Section PGA in the loss of our Member, Gene Siller.
"Thoughts and prayers for his family and the Pinetree Country Club family."
The Georgia State Golf Association also paid tribute to Siller, posting their own tweet that read: "All of us at the GSGA are deeply saddened by the tragic events that occurred earlier today at Pinetree CC. Our thoughts and prayers are with Gene Siller's family and friends."
PGA of America President Jim Richerson made a statement that said: "We are truly heartbroken to hear about the senseless murder that took place yesterday at Pine Tree Country Club in Georgia that took the life of PGA member Gene Siller.
"PGA of America sends our thoughts, prayers and deepest sympathy to his family, club and the Georgia PGA Community."
So far, no-one has been caught and no motive has been ascertained.
Siller is survived by his wife and two children. A GoFundMe page has so far raised more than $165,000 (£119,000) for the family.
Cobb County Police continue to investigate the shooting.
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