A chart in the Washington Post, using data from The Organization for Economic Cooperation and Development, shows Australia to have among the lowest gun-related killings in the developed world. The United States had the highest. Former Prime Minister John Howard told CNN's Christiane Amanpour in March that gun control laws instituted after a mass shooting were responsible for the low number.
One Australian newspaper, under mug shots of the three suspects, ran the headline: "Faces of Evil: The teens American police say shot our star."
A Facebook page set up in Lane's honor, R.I.P Christopher Lane, had more than 67,000 followers by Thursday morning, with posts describing his slaying as senseless and tragic.
Lane grew up in Oak Park, a northern suburb of Melbourne in the southern state of Victoria. He showed sporting talent early on and started playing T-ball, a children's version of baseball, at age 7, according to Essendon Baseball Club president Tony Cornish.
"It's shocked our world. The baseball community in Australia is a tight-knit group. Most baseballers know most baseballers, and everyone's shattered," he said.
Cornish said Lane was a "very good athlete" who could have played Australian Rules football but chose baseball because it offered him the chance of a college education in America.
"If it didn't work out, he could have come back to Australia with an education and also been a much better baseballer. He would have been an elite player in Australia and at our club. That's the type of kid he is -- he created a 'win-win,' in a way, for himself," he said.
Harper said Lane loved to travel and loved the competitiveness of baseball.
Memorial game in Lane's honor
Lane's friends and family are being invited to a memorial game in his honor Sunday, and a donation page has been set up to raise money for a memorial fund in his name.
Harper visited the scene of Lane's death Tuesday. It's a grassy curb on a suburban street where flowers have been placed with messages of regret and condolence.
"I'm going to miss him forever. But I'm really glad that I got the four years with him," Harper told reporters. She and her family will travel to Melbourne for Lane's funeral on a date still to be set.
Lane's distraught father, Peter, told the media: "He's left his mark as we know, and you know there's not going to be any good come out of this, because it was just so senseless."
A former student and classmate at East Central University where Lane was studying described him as "a charming guy, genuinely good person, with great character and had a love for life."
"As cliched as it sounds, Chris was the kind of guy you want your sons to grow up to be and that you want your daughters to marry. It just breaks my heart knowing how much more he could have brought to this world as a husband, father, son, brother and friend," Sam Malchar said.
The shooting took place one day before the three suspects were due to return to school.
Security was tightened around the Duncan School District after anonymous phone threats were made to Duncan High School.
Schools opened as normal Wednesday, but students were not allowed to leave for lunch and parents were being told they could keep their children at home if they wished.