[Old Teufel Hunden]

"Didn’t his father (Martin Sheen) have a nervous breakdown while filming Apocalypse Now?"

I think he had a heart attack while filming and he was only in his 30's at the time.

[RushIsMyTeddyBear]

Oh, OK. I new he had an illness while filming. Thanks!

[Amberdawn]

Yes, Sheen Sr. did have a heart attack and it was brought on partially by his alcoholism.