Gary Sinise has shared the devastating news that his son, McCanna Anthony “Mac” Sinise, has died at the age of 33 after a long and arduous battle with cancer. The announcement carried the quiet weight of a family that had lived with illness for years, absorbing hope and heartbreak in equal measure.

Mac was diagnosed in August 2018 with chordoma, a rare and aggressive cancer of the spine and skull base—just months after his mother, Moira, was diagnosed with stage three breast cancer. While Moira responded well to treatment, Mac’s condition progressed. Surgeries multiplied. Mobility narrowed. Eventually, he was left paralyzed from the waist down.

Through it all, those closest to him describe a resolve that did not soften into despair. Even as his physical world shrank, Mac continued to create. He worked closely with the Gary Sinise Foundation, poured himself into music, and performed as a drummer with his father in the Lt. Dan Band—a shared rhythm that became both refuge and expression.

In his statement, Sinise spoke plainly about the loss no parent expects to name. He acknowledged the unique agony of losing a child, and extended compassion to other families who know that grief intimately. Reflecting on their five-and-a-half-year journey, he wrote that while the pain remains, there is solace in knowing Mac is no longer suffering—and pride in the strength he showed while he was here.

Tributes followed from across the entertainment community, including Angie Harmon and Alyssa Milano, who shared messages of love and support. Yet the most enduring tribute may be Mac’s own work. Before his passing, he completed an album titled Resurrection & Revival, which his family plans to release—music shaped by endurance, not defeat.

Mac Sinise was laid to rest on January 5. He leaves behind a legacy measured less by the years he lived than by how he lived them: with purpose, creativity, and a steadiness that refused to let suffering define the whole story.