They don't use this word before the fourth book, but of course Lucius Malfoy, Peter Pettigrew and Severus Snape (who appear in books 1-3) are indeed Death-Eaters. (Severus Snape was a death eater, then changed sides.)
Draco Malfoy became the youngest Death Eater in both the book and movie of Harry Potter and the Half-Blood Prince.
Barty Crouch junior, a Death-Eater.
A death eater. This scene isn't in the book (because Harry wasn't there).
Bellatrix Lestrange is first introduced in the fifth book of the Harry Potter series, "Harry Potter and the Order of the Phoenix." She is a loyal supporter of Lord Voldemort and a powerful Death Eater.
The book does not say. It is either the death eater battling Fred or Percy. The book does not mention who they are fighting either
Harry potter and the chamber of secrets
In the beginning of The Seventh Harry Potter Book, when The Death Eaters and Voldemort are chasing Harry.
The lastest (and last) Harry Potter book is Harry Potter and the Deathly Hallows. It was published in 2007.
Dumbledore's death scene - In Harry Potter and the Half-Blood Prince.
The first book in the Harry Potter series is Harry Potter and the Sorcerer's Stone(American title) or Harry Potter and the Philosopher's Stone(other countries). The last book in the Harry Potter series is Harry Potter and the Deathly Hallows.
Harry Potter
There will not be another Harry Potter book.