Patricia Hopkins was a woman who died in 1999 from injuries after being hit by a car.
Patricia found herself at Carnon Manor, a half-way house for the dead. She didn't want to believe that she was dead and this was the afterlife.
When the Fifth Doctor and Nyssa arrived at the house, she joined them in trying to find a way out. After Nyssa was taken by the creature in the basement, Lord Carnon told Patricia and the rest of the inhabitants that he would free them if they would kill the Doctor. Patricia hated herself for intending to kill the Doctor, but then decided not to kill him. Instead, she and the Doctor waited for something to happen.