During a recent interview with Music Business Worldwide, Nirvana’s former manager Danny Goldberg has shared some untold details about how Kurt Cobain fell into heroin problem after their huge success in 1991.

Danny gave a tragic detail, and said that Kurt Cobain’s heroin problem was developed after their massive success with Nevermind album in 1991. Here’s the whole statement:

“It was very enjoyable! I was 40, I’d been in the business since I was 19 and I’d had several successful moments that I was very proud of, but nothing like this – to be one of the managers of the zeitgeist artist in the world, not only incredibly successful, but also incredibly influential and respected by the critics.

It was extremely exciting. Unfortunately, that feeling of euphoria was pretty short-lived. Nevermind comes out the end of September [1991 – it famously knocked Michael Jackson’s Dangerous off the top of the US album chart and has sold over 25m copies to date] and by January [1992], just three and a half months later I, along with a number of other people, became aware that Kurt had developed a heroin problem.

Eddie Vedder recently broke his silence on Kurt Cobain. Goldberg added, “A heroin problem is very painful and difficult to deal whether you’re an artist or not, whether you’re successful or not, but when you throw in those additional complexities…

But to work with [Kurt], to know him, to see him accomplish what he did, to write those songs, play those shows, that was one of the greatest experiences, it was working with a genius. There aren’t that many people at that level of brilliance in the history of rock n roll: Dylan, Lennon, Hendrix, Springsteen – it’s a pretty short list, and Kurt’s on it.

So, that part of it was tremendously exciting and enjoyable. And when he was in pain, either physically or emotionally, and I couldn’t figure out how to make the pain go away, that part of it was incredibly sad. Those things co-existed.”

Click here for the entire interview.