A MISTRESS of an alleged killer, accused of strangling his wife and dumping her body, stopped him from crushing her windpipe during sex, a court heard.

Kerrie Hall described the kinky sessions she used to enjoy with Michael Roberts, then 26, who is charged with deliberately throttling his newly-wed Victoria, 25, during a sex game.

The 31-year-old gave evidence at Liverpool Crown Court from behind a screen yesterday and detailed their energetic flings.

Miss Hall told the jury: “It was like gymnastics. There was loads of action, he never stayed on one spot, he was all over the place. I’ve never done anything like that before, I was trusting him with what was going on.”

She told David Steer, QC, prosecuting, how twice Roberts put his hand round her neck during intercourse.

The Phones 4 U administration manager added: “He did it when I was close to climax and I’d tell him and be a bit vocal. At first I didn't notice it, but when he applied pressure I didn’t like it and pulled away, telling him to get off me.”

The jury has heard how Roberts killed his wife, Victoria, on November 29, before trussing her up and dumping her in the couple’s garage in Daresbury, where he left her, even texting messages to her friends and family from his dead wife’s phone about how she had gone away after leaving him for another man.