AceShowbiz - Goodbye is the hardest word to say. Still, many hoped they had the chance to say it to their loved and closed ones before they're gone forever. Sadly, not everyone can bid their final farewell to some idolized public figures, who chose to keep their health issues under wraps despite having been diagnosed with terminal illness, like Chadwick Boseman.

Despite starring in one of highest-grossing Marvel films, the "Black Panther" star had been keeping his personal live relatively private until his final days. But he's not the first and only celebrity who had been doing so. While the world is still reeling from the big loss of the SAG Award-winning actor, let's remember the stars who kept their cancer battle private until their passing.