OoP: Question re: Interview quote on the Death

[kiricat2001]

No: HPFGUIDX 61407

Well, maybe I'm making this up, but maybe not.  Perhaps one of you 
people can point me in the right direction.  

Did JKR say in a not-so-recent interview that the character death she 
was including in Book V was not only hard for her to write, but that 
it was also crucial to the plot of the series?  Or maybe it was that 
the plot required the death of this particular character?  Am I nuts?

I checked the 2001 transrcipts on the Lexicon and obviously didn't 
find what I think is out there.  Any help would be appreciated.

Marianne, not all happy about this death