Latest meme theory:
Kirsch gave this pendant to the street urchin who saved his life.
Beryl's portrait has a similar pendant. It may be that Beryl is the street urchin that saved Kirsch in the past. So maybe Beryl didn't actually kill Kirsch but somehow saved him again.
But then again there's the whole thing about Kirsch's final talk with Caenis where he is pretty clearly stated to be dead. Who knows.