Terrible. I remember your posts about him and his glass-banging attitude. Sorry he died. I hope your next fish will become just as memorable.
That sucks. I remember when my prized con died. She was a real trooper. A friend of ours found her in a dumpster in not more than a 1 gallon hex tank you couldn't even see through. She saw the tank and thought it would be cool for a beta. She didn't even keep the tank, just the fish. Gave it to use because we had some spare tanks.
That con had the most awesome long flowing fins like a male. I kept her in a 10g tank on my desk. Even found her a couple good mates, but she always ended up back in the 10g by herself. After about 6 or 7 years she finally died. It sucked. She had the best personality of any fish I've kept so far and that would be in the hundreds. Don't care what anyone says, cons can be one of the best "wet pets" you can keep.