- #90
And I really don't think Masaki was killed by Grand Fisher. He didn't remember her, he took that memory of her from Ichigo.
Rather than "Oh she suffered level decay" I'm thinking more likely that she was killed by someone very, very high on the food chain if she's stronger than Isshin.
And since she's the main protagonist's mother, may as well go all the way and assume it was whoever is at the top of the food chain (Or at least whoever will end up there as the last boss.)
Possibly that Shinigami who was shadowing Ichigo at the start of this arc.