A murder that happened in a quiet Hampshire town is being reconstructed as part of a television programme next week.
Police are making a fresh appeal for information after a woman was killed in Bosham in December - and they are also offering a £10,000 reward for information that leads to arrests.
Valerie Graves was found dead with significant head and facial injuries at a house in Smugglers Lane, Bosham, on Monday 30 December.
She and other members of her family had been staying at the property house sitting while the owners were away over the Christmas period.
Crimewatch is on BBC1 on Monday 28 April at 9pm.
Detective Superintendent Nick May from Surrey and Sussex Major Crime Team said: "We need to know the origins of this hammer.
"Do you recognise it? We need people to check if they have lost such a hammer or had one stolen in the period leading up to the murder.
"We would also ask police officers, prison staff, probation officers and professionals who work in mental health, if they have dealt with anyone who has talked about causing someone harm with a hammer, to let us know.
"If so we would like to hear from you. We are continuing to appeal for any information from anyone who saw anything suspicious in the area from late afternoon on Sunday 29 December to 10am on Monday 30 December to come forward."
Police have released these photos of a hammer which they believe is the weapon used to kill Valerie Graves in Bosham.
It was found in Bosham by the search team working on the murder inquiry.
Miss Graves was discovered dead in a ground-floor bedroom on the morning of Monday 30 December at the house in Smugglers Lane she was looking after with three other members of her family, while the owners were away.
She died from significant head and facial injuries.
A man who was arrested in connection with the murder of a woman who was killed while house sitting for friends in West Sussex has been released on police bail.
Valerie Graves' body was found at the waterside property in Bosham on the 30th December.
The 22-year-old man was arrested on Tuesday night on suspicion of murder.
He will be released on bail until the 17th February.
Valerie had been house sitting with her family whilst her friends were away for Christmas.
Police say she had gone to bed at 10pm on Sunday 29th and was found dead by one of her family members at around 10am the next morning, in the bedroom where she had been sleeping.
The family of murder victim Valerie Graves who was found dead at a house in Bosham have paid tribute to her. Police have also been appealing for help to catch the culprit.
Tim Wood said his mother Valerie Graves was "much loved and a talented artist."
The family of Bosham murder victim Valerie Graves are making a statement at a press conference.
They will join Detective Superintendent Nick May and Chief Inspector Tanya Jones for the briefing at Littlehampton Police Station.
The family of Valerie Graves who was found dead at a house in Smugglers Lane, Bosham, on Monday 30th December have paid tribute to her. Her family said: "Val was a much loved daughter, sister, mum and nan, who will be sorely missed by the whole family.
"Val was a free spirit who enjoyed her life and was a talented artist, about to embark on a new path involving ceramics.
"She was an eternal student, who was always hungry for a new challenge.
"She had recently moved back to Sussex from Scotland to be closer to her family and we were lucky enough to spend a family Christmas together.
"This has been a complete shock to the family and we appeal to anyone who has any information, no matter how trivial, to contact Sussex Police."
A woman who was found dead in West Sussex died from "significant head and facial injuries" according to a post mortem examination. Valerie Graves, who was 55, had been house sitting in the property on Smugglers Lane in Bosham when she was killed.
Police are continuing to appeal for witnesses to come forward.
Police have launched a murder inquiry after woman's body was found in a Bosham home yesterday with a head injury.
ITV News Meridian speaks to Detective Superintendent Nick May from Surrey Police about the suspicious circumstances of the death.