Henry was the voice inside the head of Kimberly Shaw which drove her to blow up the Melrose Place Apartment Complex. At first, he seemed to be just an imaginary voice inside Kimberly's head, but as she went through therapy, it was revealed that Henry had been an actual person.
Kimberly revealed her visions of Henry to Peter and he decided to call Marion Shaw to see if she knew anything. Marion came to Los Angeles with plans to take Kimberly back to Cleveland once again but soon confessed she knew who Henry was.
When Kimberly was seven years old, her father was away on business. Marion was in the kitchen making a cake for Kimberlys birthday. Henry, their gardner, came in and soon began to rape Marion. Kimberly saw this, picked up a knife, and killed Henry. With this breakthrough, Kimberly received treatment and was soon let out into Peter's custody.