Voldemort murders in GoF

[dowen331]

No: HPFGUIDX 42649

This is my first posting to this group.  Forgive me if I'm repeating 
an old question, but I can't find the answer and it's really bugging 
me...

In the first chapter of GoF, Voldemort clearly says, "one more death 
and our path to Harry Potter is clear."  What death is he referring 
to?  Here's where I've gotten so far in my thinking on the 
possibilities:  Bertha Jorkins was already dead at this point; Mad-
Eye Moody was not to be killed, but kept under the Imperious Curse; 
Mr. Crouch was also not killed until he tried to escape the curse.  
Cedric Diggory was not expected to come with Harry with the cup, so 
that can't be who Voldemort's referring to.  Who else is there?  I 
can't think of anyone else killed in the plot who stood between 
Voldemort and Harry.  Any ideas?

Debbie