The following is a transcript of JK's interview with Jeremy Paxman about the launch of Harry Potter and the Order of the Phoenix.
Jeremy Paxman: So this is it?
JK Rowling: This is it.
JP: Are we allowed to look inside it?
JKR: Hmmmm. Yes a bit. You can have a look there... Yes so, that's it.
JP: How many pages?
JKR: 766... All with writer's block, which I think you'll agree is quite an achievement.
JP: But do you find the whole secrecy issue, the need for secrecy, a bit ridiculous?
JP: Why not?
JKR: Well, a lot of it comes from me.
JKR: Yeah definitely. I mean, of course one could be cynical, and I'm sure you would be disposed to be so, and say it was a marketing ploy, but I don't want the kids to know what's coming.
Because that's part of the excitement of the story, and having - you know - sweated blood to create all my red herrings and lay all my clues...
To me it's not a ... This is my ... This is my ... I was going to say this is my life. It's not my life, but it is a very important part of my life.
JP: Is there going to be a death in this book?
JP: A horrible death of a significant figure?
JKR: I went into the kitchen having done it.
JP: What - killed this person?
JKR: Yeah. Well I had re-written the death, re-written it and that was it. It was definitive. And the person was definitely dead.
And I walked into the kitchen crying and Neil (JK's husband) said to me, "What on earth is wrong? and I said, Well, I've just killed the person".
Neil doesn't know who the person is. And he said, "Well, don't do it then." I thought, a doctor you know. And I said "Well it just doesn't work like that. You are writing children's books, you need to be a ruthless killer."
Speaking about life after Harry Potter JK Rowling said:
JKR: It's going to be very difficult to leave it. I mean I do look forward to a post-Harry era in my life, because some of the things that go along with this are not that much fun, but at the same time, I dread leaving Harry.
Because I've been working on it over what I sincerely hope will prove to have been the most turbulent part of my life and that was the constant, and I worked on it so hard for so long, then it will be over and I think it's going to leave a massive gap.
About the length of time it took to write Order of the Phoenix, Rowling said:
JKR: Just once and for all, for the record, I didn't miss the deadline. Because there was no deadline.
JP: And you didn't have writer's block on that book?
JKR: No! I just produced a quarter of a million words!
Commenting on the speculation there's been about how the Harry Potter series might end and what will become of Harry and his friends, JK Rowling told Paxman:
JKR: There is one thing that if anyone guessed I would be really annoyed, as it is kind of the heart of it all.
And it kind of explodes everything - and no one's quite got there, but a couple of people have skirted it.
You can watch the full interview with JK Rowling on BBC TWO on Thursday 19 June at 7.30pm.