LITTLETON, Colo. — A family, sheriff’s office and community are mourning the loss of a 4-year-old boy killed in a “tragic accident” that involved a slack line or zip line Friday morning in Littleton, Colorado. Jefferson County, Colorado Sheriff’s Deputies say they were called to the 6000 block of South Jay Way for a tree that fell on a 4-year-old boy. Deputies said a group of kids was playing on a slack line or a zip line between two trees when one gave way and fell on top of the boy.

KCCI reports a GoFundMe identifies him as Maximillion Wood from Indianola, Iowa. The Wood family was visiting other family members in the neighborhood when the accident happened. Maximillion’s 14-year-old sister was also hurt and is expected to be okay. Karlyn Tilley, public information officer for the Jefferson County Sheriff’s Office in Colorado, says “Although we are still investigating this death, we have no reason to believe this was anything more than a very tragic accident. It was incredibly traumatic for all of the children who witnessed the incident. The Jefferson County Sheriff’s Office provided victim advocates to the family, the owners of the home where the incident occurred, and to all other children who were in the yard.”

The GoFundMe said Maximillion would have started kindergarten this year and that he looked up to his siblings and his parents.