A prosecutor told jurors in Reading Crown Court that Robert Brown wanted to keep his heiress wife's money, The Sun reported. The couple signed prenuptial agreements before their 1999 marriage.
The couple's children were in another room in Tun Cottage, the luxurious house where Joanna Brown remained after their separation, when he is alleged to have attacked her. Graham Reeds, the prosecuting lawyer, said Brown left his son and daughter with his girlfriend while he buried his wife in Windsor Great Park.
Brown has acknowledged hitting his wife with a hammer but denies he killed her deliberately.
"The remote location of the grave, the advance preparation of it, and the collection together of materials needed to dispose of her body are clear indications that the defendant planned to murder his wife," Reeds said.