He had been honest about his struggles with addiction. Diane sat down with him in 2006 after going into rehab then and coming out with it with new hope. Was there one moment that you fell into it... See More
He had been honest about his struggles with addiction. Diane sat down with him in 2006 after going into rehab then and coming out with it with new hope. Was there one moment that you fell into it again, one day? No. Usually it's very gradual. You're standing at a precipice looking down and there's a voice that goes, yeah, just one. There's a voice that goes jump, and just the idea of just one. For someone who has no tolerance for it, that's not a possibility. To talk about it as caused by something -- It's not caused by anything. It's just there. It's latent. Waits. It lays in wait for the time when you think it's fine now, I'm okay, and then, beep, and then the next thing you know, it's not okay. It's not going so well. Was there something somebody said to you, one sentence that got through, that sailed through -- You're drunk! No. It's like, you need help, and that's the best sentence that got through. Family, friends? Many people. It was pretty much you unanimous on that level and you go and say that's it, yeah, you're right. How long before you decided this is it? I don't know. It was a couple of years of just thinking I can do it on my own, and you can't. That's the bottom line. I can do this, I can stop, and you really think you can. Then you realize I need help, and that's the operative word. Robin Williams with Diane and so honest in that interview. I want to get right to Dr. Jenn Ashton tonight. Our medical unit has been making calls to the experts today. You learned something very eye opening from suicide prevention centers. Since this tragic story broke we've learned that calls to suicide prevention hot lines have spiked. People are asking for help and people are offering help. One of the most important points we make is that robin Williams was not alone. Far from it. In fact, the Numbers state that nearly one in ten Americans have suffered depression in the past year. Many others dealing with addiction. The good news is there are new and effective treatments. These diseases are treatable. Dr. Ashton with us here tonight, thank you.
This transcript has been automatically generated and may not be 100% accurate.