by highsorcerer » Monday 10 November 2003 9:20:42pm
Lord Voldemort isn't exactly on the front lines, so I'd predict a Death Eater. I'd bet on Bellatrix Lestrange; she enjoys killing, and will want to try to redemn herself for her failure at the Department of Mysteries. Besides, she's the only Death Eater (of those that went to the DoM) that escape (several Death Eaters did not join the battle, including Goyle and Pettigrew).
Known kills are as follows.
Lord Voldemort: Tom Riddle, Sr., Tom Riddle Sr.'s parents (Voldemort's grandparents), James Potter, Lily Evans Potter. This does not include others during his height of power, otherwise unknown. Attempts were made on Harry Potter (5 times; 1 year old, via Quirrell at Quidditch and at end of PS/SS, via Ginny Weasley/diary self, during GoF, and OotP) and Arthur Weasley.
Peter Pettigrew (Wormtail): 12 Muggles with his own wand (revealed in PoA); Cedric Diggory, Bertha Jorkins, Caretaker Frank (all during GoF with Voldemort's wand).
Bellatrix Lestrange: Sirius Black (OotP)
Barty Crouch, Jr.: Barty Crouch, Sr. (GoF)
There was mention of other OotP members killed by Death Eaters by Alastor Moody during OotP, but I don't recall if it mentioned specific killers to go with the names. Sirius Black's brother was also murdered, but by an unknown death eater (on Voldemort's orders).