COLUMBUS — From tragic loss comes the gift of life.

John B. Mullins IV, an 11-year-old who gave so much on the baseball field, is giving even more to others, so they can laugh and sing and continue to play catch with friends.

Four days after their son suffered a fatal brain aneurysm while batting in a youth baseball game June 16, John and Erica Mullins of Columbus elected to remove their sweet, sports-adoring boy from life support — then donate his organs so others would benefit.

“One of our closest friends not only was an organ donor — he donated a kidney to his dad — but also received a heart transplant in 2015, so John knew how important organ donation was. He was very sensitive to that fact,” said John B. Mullins III, who Friday afternoon joined Erica in talking about their “John John.”

“We know he impacted adults, but we’re learning more and more how he impacted other kids,” said Erica, who is a physical therapist. “We encouraged him to be a leader, and what some of the boys on his team are saying is that if they had a bad game, ‘John was the first to tell me it’s OK and make me feel better.’ They said when new kids came to the team, John John made them feel part of the group very quickly.”

Many of those teammates lined the hallways in their baseball uniforms in an “honor walk” at Nationwide Children’s Hospital on Thursday as staff members wheeled John to surgery, where his organs — everything from lungs and kidneys to heart valves and corneas — were removed for future transplants.

“There will be many receivers from his tissue,” Erica said, adding that, except for his condition — brain arteriovenous malformation (AVM), in which blood vessels do not form properly — her son was a picture of health. The family never knew about the condition.

“He was born with AVM, so [the vessels] were destined to rupture at some point, whether he was a baby or 80. It just happened at 11,” she said.

John had fouled off a pitch when he stepped out of the batters box, complaining that his head hurt.

“I knew something was wrong,” coach Brian Danielson said. “He walked toward me and I asked, ‘John, are you all right?’ You could see his legs were weak. I thought he was dehydrated. I was thinking heatstroke. We called the squad, and I went to open the gate to let the squad in, and by the time I did that it had gone south fast.”

Players from both teams watched it play out.

“There were a lot of 10- and 11-year-old kids who I hope never have to experience this again,” said Danielson, explaining that grief counselors were made available to players and parents at Watterson High School.

John’s impact on the northeast Columbus community where he lived and at Indian Springs Elementary, where he had completed fifth grade, helps explain the success of the GoFundMe pages to defray funeral costs and fund foundations and scholarships in his name. One had raised $58,205, far surpassing the goal of $5,000, as of late Monday afternoon. Another that had set a goal of $6,000 had raised $13,153.

“We will be giving back to the community in some way, shape or form,” Erica said.