Mystery of the 10th hole sand trap killer: Two men found dead in Georgia gunman's pickup after he shot dead pro-golfer who tried to stop him driving on a green were NOT from the state and had no ties to the area

Cobb County Police say golf pro Gene Siller, 46, was shot in the head by an unidentified gunman at Pinetree Country Club in suburban Atlanta on Saturday after 'witnessing an active crime' unfolding

The mystery surrounding the murder of a pro-golfer at a Georgia country club continues to deepen after police revealed the two other men who were also shot dead were out-of-state residents with no known ties to the area.

Cobb County Police say golf pro Gene Siller, 46, was shot in the head by an unidentified gunman at Pinetree Country Club in suburban Atlanta on Saturday after 'witnessing an active crime' unfolding.  

Siller, who was director of golf at the club and a married father-of-two, was not playing at the time but was walking towards the 10th hole after hearing that a white Ram 3500 pickup truck was being driven onto the course by the suspect. 

Police believe Siller was shot dead after approaching the truck, which had become stuck in a sand trap. His body was found on the green close to the vehicle when police arrived on the scene. 

The bodies of two other men - Paul Pierson, 76, of Kansas; and Henry Valdez, 46, of California - were then found dumped in the bed of the truck having suffered gunshot wounds.

The truck being driven by the gunman was registered to Pierson.   

Pierson and Valdez were from out-of-state and had no known links to the area or the country club, according to police.  

It is not clear if Pierson and Valdez knew each other. Pierson is believed to have been in Atlanta for business, according to family friends. 

Police have not confirmed if the crime Siller witnessed was the killing of the two men or another offense. Other golfers on the scene recalled hearing five or six gunshots.

Siller, who was director of golf at the club and a married father-of-two, was not playing at the time but was walking towards the 10th hole after hearing that a white Ram 3500 pickup truck was being driven onto the course by the suspect 

Siller was director of golf at the club and a married father-of-two. He is survived by his wife Ashley and their two sons, aged 6 and 7

Pinetree reopened the golf course on Wednesday and Siller's widow Ashley laid flowers at the 10th hole where her husband was murdered. The hole will remain closed for play for now, according to the club

The gunman, who police say has still not been identified, fled the scene before authorities arrived and remains on the run five days after the triple homicide. 

The public safety office for nearby Kennesaw State University had put out an alert immediately after the shooting describing the suspect as a 6-foot-1-inch Hispanic male with long hair, dark-colored work pants and a white or tan shirt.

When contacted by DailyMail.com on Thursday, police denied having a suspect description and said they were still investigating who was responsible.

Other law enforcement agencies in nearby areas said they hadn't issued alerts about the gunman at the time because the description of the suspect was too vague.  

Police said they are still trying to determine a motive for the triple homicide and, despite the gunman still being on the loose, insisted there was no 'active threat to the public at large'. 

In the days before the incident, Siller had confronted a man who had been fishing on the golf course and the man became so agitated that Siller called the police, Fox 5 Atlanta reports. 

It is unclear if the incidents are related.    

Police have released few details about the investigation. 

'We are aware that the public has many questions, the most pressing one being why this happened; however, it is too early in the investigation to speculate as to motive,' police said in a statement. 

Police in Georgia say pro-golfer Gene Siller (left and right) was not targeted, but was killed for witnessing a crime in progress on Saturday 

Siller leaves behind his wife and two young children (pictured together) 

Siller had only briefly dropped by the course on Saturday to remind staff that the driving range would be used to set off fireworks for July 4. He was director of golf at the Pinetree Country Club in Kennesaw

Pinetree reopened the golf course on Wednesday and Siller's widow Ashley laid flowers at the 10th hole where her husband was murdered, according to 11Alive.  

The hole will remain closed for play for now, according to the club. 

Siller had only briefly dropped by the course on Saturday to remind staff that the driving range would be used to set off fireworks for July 4, instructor Corey Evans told The Atlanta Journal Constitution. 

Evans said the club had been 'thriving' under Siller's leadership. 

'It's the most members the club has ever had.' 

The Georgia State Golf Association paid tribute to Siller, saying: '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.' 

The Georgia PGA also issued a statement offering its condolences on Twitter: '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.'

Siller leaves behind his wife and theirtwo young sons aged 6 and 7.

A GoFundMe set up to help support his family had already raised more than $620,000 by Thursday. 

His funeral has been arranged for next Monday.