Cailinn is a character first appearing in The Walking Dead: Descent.
Nothing is known about Cailinn's life prior to or as the outbreak began, except the fact that she was 63 years old and she was a school cook.
Cailinn is one of the members of Jeremiah's group that get trapped in his Church. After being rescued from the herde of walkers by Lilly and the Woodbury survivors, she becomes a member of Woodbury. Jeremiah listed Caitlinn, as being best suited for Day care in Woodbury, as he hands Lilly a chart of the members of his groups best attribute, age and occupation. Later, Cailinn along with Rose and Colby butcher a couple of rabbits, deep fry them and serve them around to the residents of Woodbury.
After the Church group finally decides to all be part of the mass suicide in Woodbury to join with God, Cailinn is one of the females of the church group that prepare the sacramental food and drink back in the kitchen. After the idea of taking their lives fails, as Bob switched out the poison with water, Stephen blows the Woodbury gates as part of the plan, to let the undead in. However, as they failed to take their own lives, the Church group scatters as the horde arrives in Woodbury.
After Stephen blows the gates to Woodbury, Cailinn, Colby and Rose try hiding in the back of the Dew Drip Inn. However the walkers get through the service entrance and devour the women on the kitchen floor.