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Dad-of-three Edmund Echukwu, 35, attended the private sex party at the £3m mansion in Radlett, Hertfordshire.

The inquest heard that at the "James Bond meets Pussy Galore" party he suddenly grabbed a woman he was swimming with before diving under water.

The woman, named only as Rachael in court, said she thought Mr Echukwu was just messing around and wriggled free from him.

Social worker Mr Echukwu, from Edgware in Middlesex, was underwater for ten minutes before the alarm was raised, according to guests.

A male reveller reportedly warned guests by saying: "He's been under too long".

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Rachael, who has obtained a High Court Order this week to conceal her identify, said she had been dancing with Mr Echukwu.

She told the inquest: "I don't think I even knew his name. I don't remember it. He was really polite. He didn't talk on the dance floor and I don't remember him being drunk.

"I said 'I am going to the pool, do you want to come with me?'

"He was swimming with me. It gets deeper really quickly. We went past the halfway, where it was beginning to get deep.

"He was by my side and this part of the pool is very deep. I couldn't touch the bottom. He just grabbed my neck like that and pulled me under the water.

"I had to push him away because I feared he would drown me and pull me under."

Paramedics were called when Mr Echukwu did not resurface and they performed CPR at the scene.

He was rushed to Watford General Hospital where he was pronounced dead shortly before 1.40am on Saturday, March 28.

Adult-themed parties have been held regularly for 19 years at the house in Radlett.

The parties were hosted by Richard Stanley, 66, and his partner Janet Harrison.

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In a statement she said that she let "shy" Mr Echukwu into the house and he told her he wanted to "try new things and make new friends".

Mr Echukwu told his pal Anthony Okonkwo that he was "going to evening Mass at church," the inquest was told.

Geoffrey Sullivan, senior coroner for Hertfordshire, ruled that Mr Echukwu died by accident just after midnight.

The cause of death was given as immersion and minor alcohol intoxication.