A friend of a man accused of murdering his aspiring model girlfriend in a jealous rage told a court today he was obsessed with her and boasted that she was lucky to have him.

Jasmin Snook told a jury at Winchester Crown Court that she had also heard Elliot Turner threaten to kill 17-year-old Emily Longley in the days before the prosecution allege he strangled her in his bedroom in Bournemouth, Dorset, on May 7 last year.

Miss Snook said Emily had told her on May 2 that she did not want to be with jewellery shop worker Turner, but she wanted to be friends with him.

Miss Snook was told by Turner, who denies murder, that he had looked at Emily's Facebook profile and had seen she was contacting other men.

''He (Turner) was saying that she was lucky to be with him and he didn't understand why she was doing things like this - she made him look like an idiot.

''He was obsessive. He was constantly talking about her. He was not listening to me say they were just friends. In the end I had to make an excuse to go home.''

She told the court that Turner, 20, had found out Emily was meeting another man at a nightclub in Bournemouth on the evening of May 5.

Miss Snook said she met Turner and he was angry and he tried to snatch her mobile phone from her.

''He was trying to find out who she (Emily) was with,'' said Miss Snook, 19. ''I was quite scared about the way he was acting. I just wanted to get out of there and go home.

''He said he was going to smash her face in: that he didn't care if he did ten years - she was going down. She was dead - things like that.''

Later Turner, Miss Snook and other friends drove to the Klute nightclub where it was thought Emily was.

Turner then got into the car Miss Snook was in and locked the doors.

''He asked me if I was OK. He was talking about Emily, trying to find out constantly about who she was with.''

He then took a lump hammer out of the car, put it in his waistband and went in to the nightclub, the jury heard.

Miss Snook went home but soon got a text message from Turner asking to meet outside her house.

''He was near tears. He was acting weird. He said: 'she's dead'. He started crying hysterically.

''He said, 'I killed her, I smashed her on the head seven times with a mallet. I heard her skull crunch'.''

Turner said he had dumped her body in the bushes close to the nightclub.

''He was saying 'she's never going to have a family. She pushed me to it. She knew what she was getting herself in to. He would always be her boyfriend'.''

But then she said Turner started laughing and said he was joking.

''He said she was at home asleep and in a parallel universe he would have killed her,'' Miss Snook said. ''I started crying.''

''He said that the next night she would not be staying with me but with him and I needed to tell her how lucky she was to be with him.

''He was just talking about Emily constantly. He said he needed that one last night with her. He said he could get anyone he wanted and she needed to realise that.''

On the last night the group went out together Turner bought Emily flowers and chocolate and then followed her around the Bournemouth and Poole areas and they argued before he found her at a friend's house and took her back to his place.

Miss Snook said: ''I told her not to do it. I said, 'I wouldn't if I were you'.

''She said she didn't know and she wanted to talk to him.''

Miss Snook then texted to ask if she was Ok and Emily replied: ''I'm OK. We will talk in the morning. I will go home. I'm not staying with Turner.''

Miss Snook told the jury that she tried to contact Emily again, but received no reply.

The court has already heard Turner said he and Emily argued in the bedroom, and that she attacked him and he defended himself.

He explained he woke up beside her later that morning, started to get ready for work but she was dead.

The prosecution allege that heavily-built Turner strangled the business studies student and part time shop worker and that he was a violent and jealous boyfriend, fearful she was being unfaithful.

He ''went absolutely nuts'' it is claimed, in a culmination of a month of anger and upset over his suspicions she was ''twisting his heart''.

When arrested he had his passport in his pocket and his bags packed, the court heard.

He told officers at the scene: ''I never meant to harm her, I just defended myself.'' He then made no comment in police interviews.

Turner's parents Leigh Turner, 54, and Anita Turner, 51, are also in the dock accused of covering up for their son by destroying evidence and taking items away from the scene of the death. They both deny perverting the course of justice.

Emily had been born in Britain but her family had emigrated to Auckland, New Zealand when she was nine.

She had returned to live with her grandparents in Bournemouth, Dorset, to study, when she died.

Turner also denies perverting the course of justice.

The case was adjourned until Monday.