JKR tells fan that there is a reason why Sirius had to die --- Oh really...

[vmonte]

No: HPFGUIDX 101174

Bren wrote:

But I have a question: this means that Sirius would have to be ALIVE
to go back in time and change his actions, no? AS far as we know,
the "original" Sirius was somewhere else, thus he didn't arrive at GH
until it was too late. There is only one time line, but for one to
go back and create a duplicate copy of oneself... Then how is
Sirius' death at DoM helpful in relation to what happened at GH many
years ago?

vmonte responds:

Thanks for the post. Sorry, I'm not explaining myself well. I think
that Sirius is dead. Let's say that Harry goes back in time and meets
up with young Sirius. Maybe Harry miscalculates and goes back too
far, to when his parents were in school. (It would be funny actually
if Sirius and Harry were both walking around the campus with the
maraurder's map, and then found each other. What did Sirius say in the
PoA movie--something about the map never lies?!)

Anyway, Sirius somehow learns of all the events that have happened in
Harry's life (or he figures it out). Sirius then makes a conscious
decision to change history. He changes his actions so that he dies
during that earlier period in time and not later, after being in
Azkaban. (It seems to me that Sirius was going to die no matter what
DD or anyone tried to do. I think that Sirius would prefer to die on
his terms rather than live the next 13 years in prison and then to
die after he comes out.)

I've also been thinking that it would be really awful for Harry to go
back in time and witness his parents death again. Perhaps he has only
one shot of going back, and he miscalculates, going too far. He ends
up at Hogwarts during James school days, bumping into Sirius. The
voice we hear at GH may very well then be Sirius. (Or Sirius changes 
history so that Harry is no longer the person we hear at GH, it is 
now Sirius.) 

By the way I think that DD has been time-traveling through-out the
books. I've started putting together a list of curious
statements/situations.

vivian