Robert Brown, 46, who is reported to have grown up in Edinburgh, is suspected of killing his estranged wife Joanna, whose body has not yet been found.
Police are continuing to search for her in Windsor Great Park, which is near the country mansion where she lived. Brown of Ascot, Berkshire, is in police custody and will appear at Slough Magistrates' Court.
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Hide AdMrs Brown, also 46, was reported missing at 8am on Monday after a family member raised the alarm.