Unidentified male Death Eater during the Battle of Hogwarts

This unidentified Death Eater was serving Lord Voldemort at last in 1997-1998. He was present in

the Meeting at Malfoy Manor and in the Battle of Hogwarts.

Second Wizarding War
This Death Eater, in his early life, was possibly sorted in Slytherin, like the rest of Voldemort's folowers. During the Meeting at Malfoy Manor, Charity Burbage was killed by Voldemort , and every Death Eaters that were present laughed at her.

When Harry Potter, went to the forbidden forest , this Death Eater was there along with Voldemort, Bellatrix and the rest of Death Eaters.

The last time we saw him is when Voldemort is giving a speech, and Harry was "death" in front of him.

Behind the Scenes
This Death Eater is portrayed by an unknow actor in Harry Potter and the Deathly Hallows: Part 2.

He may be, Augustus Rookwood or another Death Eater.