Giallonardo, who played for the Windsor Spitfires, passed away at the age of 39 after battling cancer.
The OHL expressed their sorrow on their website, saying:
Giallonardo's hockey journey spanned four seasons in the OHL, all with the Windsor Spitfires from 2001 to 2005.
After his time in the OHL, Giallonardo continued playing for St. Thomas University for three more seasons.
He wrapped up his playing career during the 2008-09 season, taking his skills overseas to Italy. There, he played for Alleghe in 46 games before retiring.
The news of Giallonardo's passing has left the hockey community in reflection, remembering his contributions to the sport and the mark he left in his career.
The OHL's announcement serves as a reminder of the impact individuals like Giallonardo have on the hockey world.