Detectives are continuing the hunt for the body of a wealthy guesthouse owner, who they believe has been murdered.
Joanne Brown, who runs an award-winning bed and breakfast in Ascot, Berkshire, was reported missing at 8am on Monday after vanishing from her sprawling country mansion.
Following the call and an initial examination of the property, officers from Thames Valley Police's major crime team arrested a man in his 40s from the Windsor area of Berkshire on suspicion of murder.
Police confirmed he was known to twice-married Mrs Brown, 46. He was named in reports as her second husband, airline pilot Robert Brown.
On Monday forensic investigators cordoned off the house and grounds of Tun Cottage, which borders Windsor Great Park, and began hunting for clues surrounding Mrs Brown's disappearance.
The mock-Tudor guest house - worth in the region of £3 million - is described on its website as "a beautiful English country home" and has been awarded a 4-star Gold Award by Visit Britain.
Mrs Brown was understood to have lived at the mansion for 12 years before turning it into the upmarket guest house three years ago.
A police spokesman said: "Thames Valley Police has arrested a man in his 40s from the Windsor area on suspicion of murder.
"At this time, officers are yet to locate the woman, who is aged in her 40s."
The suspect remains in police custody at Maidenhead police station, where he is being questioned by detectives.