|Location:||1254 Piedmont Avenue, Haddonfield, Illinois|
|Birth:||June 7, 1952|
|Death:||October 31, 1978 (Mistakenly November 1st); Age 26|
|Portrayed By:||Pamela Susan Shoop|
|First Appearance:||Halloween II|
- "It can get cold in here."
- ―Karen Bailey[src]
Karen Bailey was born in Haddonfield, Illinois to Lawrence Bailey and Melissa Bailey on June 7, 1952. She was a nurse at Haddonfield Memorial Hospital and romantically linked to paramedic Budd Scarlotti. She was an excellent nurse but struggled with punctuality. Earlier in the night of Halloween 1978, Karen and her friend Darcy Essmont were leaving a Halloween party. Karen complained about bobbing for apples and that she was going to be late for work. Darcy then made Karen remember that she promised to take her home. Knowing that she was going to be ten minutes late, Karen decided to keep to her promise and took Darcy home. As soon as Karen arrived, nurse Virginia Alves reminded Karen that she was late again, Karen tried to reason it was only for a few minutes but Mrs. Alves told her that those few minutes could mean life or death of the babies that Karen had to watch over. Karen knew that she was right as Mrs. Alves told her that she needed to be on time more or else she would lose her job. Later in the night, Karen was working when she heard a buzzer go off in a patient's room. She came into the room and discovered that no one was there. As she got closer to the bed, it turned out to be Budd who had the buzzer go off and he scared Karen. Budd and Karen snuck off to spend some quality time together in the hospital's hydrotherapy tub.
Once Karen got in, she complained that the water was too hot. At first, Budd tried to get her into the mood but she kept pushing him off, telling him to cool the pool down or else she would leave. Budd did as he was told but was missing for a while. Karen got out and toweled herself off and then a hand touched her shoulder. Assuming it was Budd, Karen told him that she had to get back to work. However, she soon realized that it was not Budd, but rather escaped mental patient Michael Myers who had turned up the water temperature in the pool. Michael dunked her face into the water, drowning and scalding her to death.
- Karen's social security number was 115-18-5415.
- Karen's corpse was attended by Graham from 8:30 PM on November 1, 1978 to 9:15 PM on the same night.
- Her death won the Golden Chainsaw Award in Dead Meat's Halloween II (1981) kill count.