A 9-year-old boy who was hit in the head on Saturday during a National baseball Congress World Series game has died, the amateur Liberal Bee Jays baseball team announced on its Facebook.

Kaiser Carlile was running to pick up a bat on the ground near the on-deck hitter, who didn’t notice him and accidentally hit him on the head with a practice swing, CBS reports. Paramedic and home-plate umpire Mark Goldfeder treated Carlile until the ambulance arrived.

“With the permission of the family, and with much sorrow and a very broken heart, I regretfully inform everyone that Kaiser Carlile passed away earlier this evening. Please keep his family and our team in your thoughts and prayers. Thank you all for the support during this ordeal!” said the team’s president, Nathan McCaffrey.

Carlile was wearing a helmet, as required.

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