CNN  — 

Golf pro Gene Siller was among three men found dead on the grounds of an Atlanta-area golf club in an incident still surrounded by many unanswered questions.

Siller, 46, and the other two men were discovered Saturday at the Pinetree Country Club in Kennesaw, Georgia, according to police.

One of the slain men was identified by police as Paul Pierson, 76, of Kansas.

Wednesday, Cobb County police identified the third victim as Henry Valdez, 46, of California.

Siller, Pinetree’s director of golf, was found unresponsive with an “apparent gunshot wound to the head” and was pronounced dead at the scene, police said. Pierson and Valdez also suffered gunshot wounds.

Investigators have not yet released the name of a suspect and say they are following leads to determine why the shooting happened.

But in the days following the deaths, some more information has been released. Here is what we know:

The timeline

Cobb County police said they were called to a report of a person shot around 2:20 p.m. Saturday and found Siller shot in the head near the green of the course’s 10th hole.

A truck was on the green, and officers found the bodies of the two other men in the truck’s bed – both of whom also had been shot, police said.

Someone had driven to the green in the truck – a white Ram 3500 pickup – and shot Siller when he arrived to see what was going on, a member of the club told CNN affiliate WXIA. The shooter then fled, WXIA reported.

Pierson was the registered owner of the truck, police said.

Pierson and Valdez “appear to have no relation to the location at all,” Cobb County police said Tuesday.

The motive

Police said Tuesday they believe Siller was killed “because he witnessed an active crime taking place.”

Police didn’t specify what that crime was. Investigators told CNN they are asking nearby residents to check their doorbell video for any clues.

“It does not appear he (Siller) was targeted,” but instead was killed because he “happened upon a crime in progress involving the unknown suspect and the two deceased males,” the Cobb County Police Department said in a news release.

Details for Siller’s funeral are unknown as his body remains at the Medical Examiner’s Office, the country club said in a statement Tuesday.

CNN has reached out to the Medical Examiner’s Office and has not heard back.

Flowers are left on the grass at Pinetree Country Club following a shooting that took the life of golf pro and director Gene Siller and two other victims.

Whom Siller leaves behind

Siller leaves behind a wife and two children, ages 6 and 7, according to the country club.

“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,” Georgia’s Professional Golfers’ Association said.

“Gene was a man of compassion, he loved everybody,” Rand Eberhard, a pastor who lives in a neighborhood near the country club and knew Siller, said. “It’s a big void that is left in our community to lose such an important guy.”

Eberhard said it would have been in Gene’s nature to help someone in need.

“He came in to check on a guy and help the guy, and this is what happens,” he said. “It’s an act of evil. It’s an act of selfishness.”

Siller’s family set up a GoFundMe page to help with finances.

The golf pro’s funeral is set for Monday morning, followed by a celebration of life in the evening hosted by the Siller family at Pinetree.

The impact on the club

Pinetree Country Club said it would reopen Wednesday, but noted staff and members are still grieving.

The 10th hole will remain closed for play, club official Lou Bottino said in a letter to members.

Bottino said Siller’s widow, Ashley, and other family members visited the 10th hole where Siller was gunned down “to see where this unimaginable tragic act occurred as part of their grieving.” Bottino said Siller’s widow added flowers to a growing memorial at the 10th hole.

Members of the country club are in the dark about why the killings happened, a friend of Siller’s said Tuesday morning.

“This doesn’t make any sense,” Brian Katrek, a member of Pinetree Country Club and an anchor of SiriusXM PGA Tour Radio, told CNN’s “New Day” on Tuesday.

“I think the reaction from members right now is still one of pretty profound shock,” Katrek said.

Correction: Previous versions of this article had the wrong age for Gene Siller. He was 46.

CNN’s Jen Bernstein, Devon M. Sayers, Gregory Lemos, Pamela Kirkland, Ralph Ellis, Alaa Elassar and Claudia Dominguez contributed to this report.