A spokesman for the Thames Valley Police said the body had not been positively identified but he said police had been searching the specific area of the royal estate after receiving information Brown's body might be there, the Daily Mail reported. He said an autopsy was to be performed Saturday.
Brown's estranged husband, Robert, 47, was ordered held without bail Friday pending another hearing Monday in Slough Magistrate's Court. He was arrested Thursday on suspicion of killing his 46-year-old wife.
Joanna Brown, 46, inherited several million pounds from her father, a developer on the Isle of Man. She married Robert Brown, a British Airways pilot, 11 years ago.
The couple, who have two young children, separated three years ago, and their divorce was about to become final.