I have finished Harry Potter and the Deathly Hallows and my "The end of Harry Potter" post is coming, once I've sorted out my thoughts in a clearer manner.
However, in the first chapter, the Muggle Studies professor is killed at Malfoy Manor. All sources I've seen online seem convinced that Lord Voldemort executed her, using the forbidden killing curse. I'm less convinced it wasn't Severus Snape.
Further argument for this would require acknowledging facts revealed near the end of the book, so I won't address it in this post, although I am willing to in comments.