A black dog reputedly haunts the castle and its surroundings. Legend has it that this is the spirit of Nell Bloxham who was not allowed to sell butter or milk from her cottage at the foot of the castle walls.
Fulke Greville is said to haunt the Watergate Tower despite having been murdered in Holborn. The castle's reputation for being haunted is used as a tourist attraction with events such as "Warwick Ghosts Alive", a live-action show telling the story of Fulke Greville's murder. It also featured as a location in Season 8 of Most Haunted.
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The castle appeared on the TV program, Most Haunted. It was featured in Series 8 (2006).
For further information, please read Haunted Britain by Antony D. Hippisley Coxe; Haunted Castles of Britain and Ireland by Richard Jones; Haunted Britain and Ireland by Richard Jones and Britain's Haunted Heritage by J. A. Brooks.