I know everyone is grieving the people that they've lost, I am too. And I know the following story might be hard for people to read, so if you'd rather not read a story about the deaths of one of the people that died during the battle, please skip the rest of the post.
When Seamus Finnigan died, he was fighting a Death Eater called Augustus Rookwood. Rookwood was a veteran of the first war against You-Know-Who, and spent the years after that war in Azkaban. He was released by YKW in the break out, and Rookwood went on to be one of the Death Eaters placed in the Ministry to further their agenda. You may recognise his name from all of the Department of Mysteries bullshit about Muggleborns.
Rookwood also died in the battle, because even as he was dying, Seamus refused to go out without taking one of the assholes with him.