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.

Gary Sinise said he was “so blessed, fortunate, and proud” to be a father to McCanna Anthony "Mac" Sinise, who died at 33 ...

Gary Sinise is mourning the loss of his son ... the harmonica in his final year and finished an album prior to his death, entitled Mac Sinise: Resurrection and Revival. It is currently available ...

Gary Sinise opens up to ET about the death of his son, Mac, and why he wanted to tell Mac's story on his foundation's website. McCanna "Mac" Sinise died in January after battling cancer for more ...