I actually remember Fallout, he later changed his name to Charm & Strange and became one of our tech support guys. It stuck in my memory as his cancer announcement was so blunt and abrupt.
While the old site no longer exists, I’ve been able to find out quite a bit with Internet Archive to see what happened to him. Here are his original posts from March 2012:
He still posted after his diagnosis and shortly before the forum switched to Discourse in June 2014 the data capture of his profile shows he was last online in January that year.
These are the most recent posts I could find which give updates on his health, as I had trouble accessing anything earlier that would shed light on his condition:
It appears he had some PM contact with @MadMax and @Devils_Advocate based on the above interactions. The last conversation I could find was him debating the minimum wage in Off Topic in early Jan 2014, shortly before he went inactive.
I can only hope he managed to fight the illnesses he was facing, as it’s clear he was struggling with a lot of issues. He doesn’t appear to have transferred to the new forum, as a search of posts didn’t bring up anyone claiming to be him, while his two known usernames haven’t been registered.
It’s sad when old members disappear, particularly ones which used to be active. People like monkeyman come to mind, as well as the infamous Choronzon. I always end up wondering what happened to them; although it’s normal people decide to take a break and end up never returning. We definitely lost a few people after the switch. They lose interest and move on.
Thanks @Bosola for bringing this up though, I hope this helps.