Cobb County police responded to a report of a person shot around 2:20 p.m. and found Siller on the green of the 10th hole of the Pinetree Country Club in Kennesaw, according to a news release from the police department.
Siller, who was a club employee, was found unresponsive with an “apparent gunshot wound to the head” and was pronounced dead at the scene, police said.
Police discovered the truck still on the green and found the bodies of two men in the bed of the truck, the release said. Both victims also suffered apparent gunshot wounds, according to police.
One of the men was identified as Paul Pierson, the registered owner of the Ram 3500, but the other victim has yet to be identified, according to police.
Police are still searching for the suspect, who has not been identified.
Siller leaves behind a wife and two children, ages 6 and 7, according to the Pinetree Country Club.
PGA of America President Jim Richerson also issued a statement: “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,” the statement said. “PGA of America sends our thoughts, prayers and deepest sympathy to his family, club and the Georgia PGA Community.”
Siller’s family set up a GoFundMe page to help with finances.
CNN’s Laura James and Jen Bernstein contributed to this report.