Please be patient while the rewrite is in progress.
Madoka Minai (南井 まどか, Minai Madoka) is a police officer. She briefly appears in the manga-exclusive arc Onisarashi-hen and has a much larger role in the Advanced Story.
Madoka tells Ooishi and Akasaka about the autopsy results for Aki Kimiyoshi's dismembered corpse. They determined that she died about 5 days ago from a cerebral contusion, and she was chopped up after the fact.