Aw, that's sad news. I watched "The Patty Duke Show" religiously when I was a kid. I thought that being Patty Duke must have been the coolest thing ever. Life was so simple then.
Then I read her book "Call Me Anna" and suddenly thought that I was the one who lived a charmed life. I was pure child abuse to let her agents take her in and run her life. It wouldn't surprise me in the least to find out that that was the normal thing back then with child actors.
“Before you embark on a journey of revenge, dig two graves.” ~~~ Confucius