ALLEGED stun gun murderer Sarah Williams spoke of ‘getting rid’ of the wife of a fellow ski instructor she had an affair with, a jury has heard.

Friends of Williams said she believed she could be together with Somapat Sitiwitjana, 47, if his wife, Janet, 45, ‘wasn’t in the picture’.

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One friend told her she was living in ‘a dream world’ and called her ‘Sarah the crank’, while another said Williams was a bunny boiler, Preston Crown Court heard.

Williams, 35, had a relationship with the Thai-born martial arts gym owner after he taught her to ski at Manchester’s Chill Factore indoor ski centre five years ago.

The fling allegedly ended before she met another ski instructor, Ian Johnston, 57, who was said to have finished with her after she became possessive and difficult.

The Crown said Williams’s obsession with ex-fireman Mr Johnston drove her to murder his partner, Sadie Hartley, 60, at her home in Helmshore on January 14 by incapacitating her with a stun gun then stabbing her to death.

Kerry Williams, a former workmate of the accused, said the defendant was ‘besotted’ with Mr Sitiwatjana, known in local martial arts circles as Master A.

She said: “There was a time when we were at my house and Sarah was talking about Master A. She said, ‘oh, I just need to get rid of her now’, referring to his wife. As I told Sarah quite often, I said, ‘you can’t do things like that’.”

She said Williams made several stabbing gestures to her head while making the ‘Psycho’ sound, made famous in the Alfred Hitchcock film.

The witness said Williams would refer to Master A’s wife as a ‘bitch’ and that she realised the relationship had ended when conversations turned ‘sour’, and Williams’s actions had become stalker-like.

Another friend, Michaela Burns, described Williams as ‘a bunny boiler’.

Anthony Cross QC, defending murder co-accused Katrina Walsh, said: “When you were to find out she was now involved with a man in his 50s, a fireman, when she was telling you about that did you just roll your eyes and think, ‘here we go again’?”

Ms Burns said: “I did when she told me he had a partner and it sounded like she had got herself in the same situation.”

Mrs Sitiwatjana told the court she found out her husband had been unfaithful when Williams visited her home when he was away in Thailand in 2012.

A letter from Williams disclosing ‘full chapter and verse’ about the relationship was later delivered by hand to her home, the court heard.

Williams wrote that she had been in a relationship with Mr Sitiwatjana for more than a year and they were ‘absolutely in love with each other’, the jury was told.

References were made to text messages that were ‘explicit in the extreme’ and that the lovers were ‘seeing each other a couple of times a week, texting incessantly and making love whenever we could’.

In September 2012, Mrs Sitiwatjana reported Williams to the police with claims that she was harassing her with unwanted texts and visits to her home, where she would ‘stare’ at her from a car parked on the other side of the road.

Williams, of Treborth Road, Blacon, Chester, denies murdering Ms Hartley. Her co-accused, horse riding instructor Walsh, 56, of Hare Lane, Chester, also denies murder.

Walsh is said to have helped her friend with the killing and allegedly wrote about staging the ‘perfect murder’ in diaries recovered at her workplace.

(Proceeding)