Jessica "Jess" Johnson is a friend of Jake's Wife. She was mentioned within Mrs. Hawkfield's diary as one of her few childhood friends, and is the only one who contacts her after she moved away. So far Jessica has only been mentioned, not seen or heard anywhere within the main story.
Chapter One: Welcome To Underhell
Jess was first mentioned in Bryan's PDA log in the upper Dormintries on level 1. She is later mentioned during a conversation between Bryan and Junior prior to Raito's unveiling.
Chapter Two: The Dead City
Although it's not really confirmed, Jessica will most likely appear in this chapter.