Martin Sheen couldn't "believe the amount of courage" his son Charlie showed when he revealed he was HIV-positive.
Martin Sheen, 75, is proud of his 50-year-old son announcing in an interview with Today show host Matt Lauer that he's been battling with the debilitating virus for four years as he knew it was the "most difficult thing" he has had to do.
Speaking at the annual CME Group's Global Financial Leadership Conference, Sheen said: "He had been leading up to this sort of story for several months, and we kept encouraging him to do it. He kept backing away and backing away because it was like going to his own execution, I guess.
"This morning, as I watched him alone, reveal his deepest, darkest secret, I couldn't believe the level of courage I was witnessing, and that it was my son.
"I left him a message, and I said that if I had that much courage, I would change the world."