Tragic news has struck actor Gary Sinise and his family as they mourn the loss of his son, McCanna Anthony “Mac” Sinise, who passed away at the age of 33.

Gary, 68, shared the heartbreaking news of Mac’s death on the Gary Sinise Foundation‘s website and his Instagram page, revealing that Mac sadly lost his battle to cancer on January 5.

In a heartfelt statement, Gary explained that Mac had been battling a rare form of cancer called Chordoma since August 8, 2018. This devastating diagnosis came just months after Gary’s wife, Moira Harris, received her own diagnosis of stage three breast cancer.