Olivia (Evil Dead)

Olivia is the quaternary antagonist of the 2013 sequel Evil Dead.

A registered nurse and best friend to Mia Allen, Olivia is possessed by a Deadite, causing her to attempt to kill her friends. Olivia takes the role of Shelly from the original film.

History
She and Eric were both around to experience Mia's first overdose (something not even her own brother was aware of until the cabin trip), and she was the most adamant on forcing Mia to not return home as she feared for her health. She has a background in medicine and is very confident in her treatment abilities, convincing David and the group that Mia was in capable hands with her after the latter crashed a car in the thick bog.

When Mia escapes from the cabin in a vain intent to avoid the demon that was after her, Olivia and David find her curled up by a tree and bring the girl back to the house, were Olivia treats Mia’s wounds and is reluctant to take her to a hospital. After Mia becomes completely possesed and shoot David in the arm, Olivia tries to reach for the gun, but Mia grabs her and begins to vomit red fluid on Olivia’s face, infecting her. Later, a scared Olivia washes her face and sees her demonic reflection with an open Glasgow smile. Olivia backs away from the mirror and walks to another room where she’s stopped cold in her tracks, and unable to control her muscles, urinates on herself.

Olivia becomes totally possesed after that and cut out a chunk of her cheek into what looks like a Glasgow smile. She tries to kill Eric in the bathroom with a broken piece of glass, but he takes a piece of broken toilet and bashes her head in until she no longer moves.

Unlike Mia and Natalie, she did not show any signs of inteligible speech after becoming a Deadite although this is likey because she was killed by Eric not long after her possesion.