The pair have each been charged with one count of murder and one count of attempted murder. Both were released on bail.
Charges relate to the death of 100-year-old Pamela Mogford on February 15, 2022 in Bledlow Ridge, Buckinghamshire.
Thames Valley Police said in 2023 its major crime unit was investigating the circumstances surrounding Mrs Mogford's death.
Pickering, of Back Lane, Guildford and Mogford, of St Giles, Oxford are due to appear again at Oxford Crown Court on March 13, 2026.
Mogford started work in the hospitality industry in 1973 when he founded Browns Restaurant and Bar in Brighton.
He is also the owner of a series of independent hotels and restaurants, some of which are in historic city buildings dating back to Victorian and Georgian times.
His collection of hotels and restaurants includes the Old Bank Hotel, Old Parsonage Hotel, Quod Restaurant, Parsonage Grill and Gee's Restaurant.

