Gutted.
Children of Bodom were a huge deal to me in the early 00's, and were considered my #3 favourite band for such a long time. He was incredibly gifted but also incredibly troubled. I haven't really loved an album of theirs since Are You Dead Yet? But those first 5 albums are just on another level! That was pretty much all down to Alexi as far as I'm aware, he was at his creative peak.
My old flatmate and I, back in the early 00's had a shrine to him in our flat, and called him sexy Alexi. He was one of a kind.