The group, called Sefton Paranormal Investigations, was at Stanley Palace on the night of June 28 when they made the discovery.
Footage taken at the investigation reportedly captures the image of a person standing on a staircase in the 16th century Tudor building.
Co-founder Aaron Robinette is seen in the video with team member Joanne May at a location they identified as a hotspot.
Aaron, from Southport, said: “We were informed by the curator that there was a staircase with a door underneath it, where a man died.
“In the video, I’m sat on a chair and Joe is sat on the staircase, and we’re calling out to spirits.
“Nothing happened, but it was only when watching the video back that I saw it. It appears and disappears in shot, all in front of the camera.
“We try to disprove it and if we can’t find a natural explanation, like shadows or reflections, it’s the main reason I believe I can categorise it as paranormal.”
Read Full Story: Chester Chronicle UK