Jurors in the Allan Kimber murder trial are continuing their deliberations on Friday.
Before retiring on Thursday, Mr Justice David Calvert-Smith told them they must decide whether five key pieces of evidence amount to "an unfortunate series of coincidences" or "clear evidence of guilt".
Kimber, 41, of Stert Street, Abingdon, denies murdering Gary Morgan, 37, his ex-wife's new husband, at Danesbrook Farm, Stanton St John, on October 17 last year.
The jury at Oxford Crown Court was told to remember: 1. The bullet that killed Mr Morgan was made by Kimber 2. The bullet had been loaded into a gun Kimber kept under his sink 3. Mr Morgan was the husband of the defendant's ex-wife 4. Kimber left and returned to his home in time to have travelled to the Morgans' home, laid in wait for his victim, shot him and travelled home again 5. Six hours after the killing, Kimber had particles removed from his eye.
The jury had been told by Kimber that he believed a man he knew only as 'Tosh', with whom he said he exchanged illegal firearms on the night of the killing, could be responsible for Mr Morgan's murder.
The judge added: "Turning the case on its head, is it possible that a man named Tosh had decided, or been hired by someone, possibly Mrs Morgan, to kill Mr Morgan using Kimber's gun without the defendant having any idea this was going to happen?"
The case continues.
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