Updated at 10:56 p.m. ET
Dallas police arrested officer Amber Guyger on manslaughter charges Sunday, after she shot and killed a man in his apartment last week. Guyger has said she mistakenly believed she had entered her own home in the same building.
An affidavit for an arrest warrant says the officer found the door ajar at what she thought was her own apartment. It says it was dark inside, she saw the silhouette of a man, and she gave him orders that he didn't follow. She told investigators she thought the man was a burglar.