Former deputy head teacher Sion Jenkins will be tried in October for the third time for the murder of his foster daughter Billie-Jo.
Billie-Jo was battered to death while painting patio doors
Mr Jenkins, 47, of Belgravia, London, denies battering the 13-year-old with a metal tent peg at the family home in Hastings, East Sussex, in 1997.
Earlier this month an Old Bailey jury failed to reach a verdict after hearing evidence for more than two months.
The new trial will be held at the same court and begin on 31 October.
Mr Jenkins was originally jailed for life in 1998 but has been on bail since his conviction was quashed and he was released by the Court of Appeal in July 2004.