DETECTIVES investigating the deaths of the uncle and aunt of "Lotto lout" Michael Carroll have "a good understanding of what happened during that tragic evening".
Stephen Muncaster died in an apparent murder-suicide in Magdalen, Norfolk, along with his partner Allison.
Detective Superintendent Paul Durham, from Norfolk Police, said: "We are continuing our investigation and are beginning to obtain a good understanding of what happened during that tragic evening. I can confirm that a Home Office postmortem [examination] will take place today morning when the cause of death should be confirmed and formal identification of the bodies progressed.
"We continue to collate information regarding the incident and once this process is complete, we will prepare a file for the coroner."
Mr Muncaster (47) was found in the front garden of a bungalow in Magdalen, near King's Lynn, in the early hours of Tuesday, while his partner Allison (48) was discovered inside the house.
They both had gunshot wounds.
Mr Carroll told The Sun that it was "sad news", but that he had not spoken to his uncle or Mr Muncaster's previous partner Kelly since 2005.
He added: "No one knows why he did it except him."
The lottery winner was living with Mr Muncaster and his since-estranged wife Kelly at the Magdalen home when he scooped a £9.7 million jackpot aged 19 in 2002.
Mr Carroll became known as the "Lotto lout" when he collected his winnings wearing an electronic tag.
He hit the headlines as he frittered away chunks of his fortune, but also gave sums to relatives including Mr Muncaster and his then wife.
