|Weapons/Accessories||Proton Pack Twin Proton Pistols|
|Vehicles and/or Gadgets||Ecto-1 (2016)|
|Residence||Zhu's Chinese Restaurant|
Jillian Holtzmann worked with Abby Yates at Kenneth P. Higgins Institute in the research of the paranormal. She joined Abby and Erin Gilbert at Aldridge Mansion, after Abby agreed to take down the book "Ghosts from Our Past Both Literally & Figuratively: The Study of the Paranormal" from the internet, once Erin took her and Jillian to the Museum and introduced them to Ed Mulgrave Jr.
The three later witnessed the appearance of the ghost of Gertrude Aldridge, although Erin got a little more than she bargained for as the ghost spewed slime all over her. Luckily Abby got the whole thing on video, which would later become viral on the internet, but was also the result of both Abby and Jillian being fired from Kenneth P. Higgins Institute and Erin being fired from Columbia University.
- She can change into Abby, Erin and Patty by using the Character Selection wheel.
- In the movie she was portrayed by Kate McKinnon. Melissa van der Schyff voices her in the game.
- Main article: Jillian Holtzmann/Gallery