Arizona Devine Watterson denies the murder of Mr Rogers. She admits she stabbed him, but says it was a tragic accident as a result of horseplay.

Prosecutor Stuart Kneale described Miss Watterson as a 'cold and calculating' woman whose account of Mr Rogers' death 'expanded and changed as time went on'.

The knife was bought from Stardust, a shop selling Pagan and Wiccan (white witchcraft) artefacts and gifts in Windsor Road, Douglas, for about £15.

Proprietor Christine Howson told the court this week the athame, which has a double-edged blade up to 2cm wide going to a sharp point, was a Pagan and Wiccan tool used to 'draw down energy from the universe'.

Its handle was black with a picture of a silver green man, which celebrates the man of the forest.

She no longer sells the type of athame which killed Mr Rogers.

Earlier in the trial, Mr Neale said Ms Watterson kept up a 'charade' for two days after police found Mr Rogers dying from a single stab wound at her home.

He told the jury of eight men and four women she 'immediately began to give a lying account of what happened' to Mr Rogers, a close friend she referred to as her cousin.

'It is the prosecution's case that the latest version of events is also a lie and that she is guilty of murder,' he added.

The court heard Ms Watterson, of Clifton Terrace, Douglas, and Mr Rogers, who was 28, of Droghadfayle Park, Port Erin, were at her flat from mid-evening on March 25 last year.

They were joined by mutual friend Maurice Sayle from 10.30pm until 1.30am, who told the court they were all in a 'good mood' and were 'laughing and joking'.

Ms Watterson called police just after 2.30am on March 26 claiming Mr Rogers had been stabbed by a stranger in the street outside her flat.

Police and paramedics found him slumped on a sofa in the flat while Ms Watterson was descrbed as being in a 'hysterical' state.

Mr Rogers was taken to Noble's Hospital but was pronounced dead shortly before 4am.

Ms Watterson later said he had been attacked by two men.

During police interviews hours after the incident, she said she would 'never do anything to harm Billy' and threatened to 'annihilate' his attackers.

Just two days later, on March 28, Ms Watterson admitted she had stabbed Mr Rogers in her flat. But she has always denied murdering him, maintaining it was a tragic accident as he stumbled forward on to the blade during horseplay with the knife.

Mr Neale said: 'The prosecution case is that she was telling deliberate lies to conceal her own guilt.'

The trial continues.