Death Eaters

[troublenbass]

No: HPFGUIDX 81260

Hello all. I am barely a grownup, but a college student whose mother is also a 
part of this board. However, I do believe that I can add to the discussion.

I have a question - and I am not sure if it has been tackled in previous posts.

In GoF, Voldemort counts his Deatheaters:
"And here we have six missing Death Eaters...three dead in my service. One, 
too cowardly to return...he will pay. One, who I believe has left me forever...he 
will be killed, of course. And one, who remains my most faithful servant, and 
who has already reentered my service."
p.651

Well, I know Crouch is the last one mentioned. Snape is either too cowardly or 
has left forever - thus, who is the third?
And who were the three that died?

Also, who is Sirius's brother...and where is he mentioned?