Chase Kowalski was seven and a first-grader at Sandy Hook Elementary School in Newtown, Connecticut when he was killed on December 14, 2012. He loved running, swimming and biking and had already completed a triathlon at age six; family remembered him as a fun-loving child with a huge heart who wanted to be outside.

The gunman, identified as 20-year-old Adam Lanza, first fatally shot his mother at the family home, then went to the school armed with a semi-automatic rifle and two semi-automatic pistols that were legally owned by his mother. He forced entry and killed 20 children and six educators, including Chase; as first responders arrived the shooter died by suicide at the scene. An official investigation concluded Lanza acted alone and no arrests were made. The motive remains unclear.

If anyone knew Chase or was connected to Sandy Hook Elementary that day and has information to share, please contribute what is known.