Addison Hammond is Jessalyn's friend.
For Jessalyn's bachelorette party, she got her friend Addison and decided to embrace their mutual love of horror by having a sleepover at the abandoned Thornton Hall. At first the girls had a lot of fun, but late into the night Jessalyn started acting strangely. Then, she vanished.
Addison was left terribly frightened and disturbed by the whole ordeal and refused to speak of it.
On Jessalyn's cell phone, Nancy calls Addison about Jessalyn's disappearance and she is a bit unwilling to help Nancy at first. However, she provides useful information about what happened to Jessalyn.