What happened to Andrew O’Keffe?

I used to love him growing up, he was the only reason I watched Sunrise because, at the time, I thought he was the only bearable host. I have a very vivid memory of him leading a debate with an expert on his side, against another host who had their own ‘expert’ on climate change. How they throughly destroyed the skeptics arguments has stayed with me.

Once I left home I stopped watching free to air all together, then all these years later I suddenly hear about him being a long time menace with a nasty drug habit. What happened to him? Did anything happen in between him leaving television and turning into what he is now? Can anyone remember how his downfall started? I’d love the lore if anyone is clued in