what happend to the riddler? (an answer for Machine)

so what happened to the riddler?  his riddles got worse but his killing got...  well, it got.  he kills now.  he's a lot more vicious.  we were given a glimpse of this during Hush & brief Green Arrow arc.  he gave professional fall-guy, Arsenal/Speedy, what-for, strapped him to a table & tortured him until Green Arrow came w/ a team of people & saved his ass.  but, his riddles got worse.  instead of being cleverly cryptic in an so-obvious-i-overlooked-that way, they've just become stupid.  see the one panel of Infinite Crisis he's in before he is killed by an exploding rock of eternity.  but he did use a Lazarus Pit to revive himself from the ails of cancer.  & w/ poison ivy & two-face returning in the current Batman/Detective story-arc, i don't see why E. Nigma can't make an appearance.  maybe he'll actually be a good match for Batman's wits this time instead of a perenial joke.  that is something i would definately like to see.