The jury in the Sion Jenkins murder retrial was sent home for the weekend after failing to reach a verdict on Friday.
The six men and six women have been listening to evidence for two months.
Former deputy headmaster Jenkins, 47, of Belgravia, central London, denies bludgeoning his foster daughter Billie-Jo Jenkins to death in February 1997.
The 13-year-old was found sprawled in a pool of blood on the patio of the family's home in Hastings, where she had been painting doors.
Jenkins was jailed for murder in 1998 but freed on bail last year following a second appeal.
The prosecution says Jenkins was the killer but he claims Billie-Jo was alive when he left the house. The judge, Mrs Justice Rafferty, told the jurors to "put emotion to one side" when considering the verdict.
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