A HUSBAND murdered his wife after she confessed to an affair while they danced in the living room, the Old Bailey has heard.
Gary Brockwell, 48, throttled his wife Gaynor, 46, at their home before phoning their son to say "your mum's dead", jurors were told.
Brockwell, whose trial began on Tuesday, admits killing his wife of 26 years but denies murder, claiming he is only guilty of a lesser charge of manslaughter due to loss of control.
Prosecuting, John McGuinness said the couple spent the evening before her death at The Coach House pub on Chelsham Common.
They returned home to Forestdale, near Croydon, soon after midnight last October 8 and began dancing.
Mr McGuinness said: "Then Gaynor said to him, 'you know how much I love you but I'm seeing someone – I'm going tonight'.
"He grabbed the lapels of her dressing gown and pushed her towards the patio door."
Mrs Brockwell, a former checkout assistant at Sainsbury's Warlingham store, then lashed out before her husband grabbed her round the throat with both hands, forcing her down to the floor, jurors were told.
"When he released the pressure, he knew straight away he had killed her," Mr McGuinness added.
"He said he never meant to kill her. He idolised her."
The couple's son Garry, 26, then received a distressed phone call from his father.
"He asked the son to come to the house and said words to this effect: 'Your mum's dead. She's on the floor. I'm looking at her'.w"
Garry took a cab from his north London home to the family house, where he saw his mother's body in the living room on a pile of cushions and covered with a duvet.
The father and son then shared a cigarette and a beer, during which time Brockwell said he wanted to go upstairs to take his own life.
Ambulance crews were called to the house at 5.24am by Garry, the court was told, four hours after Brockwell is alleged to have killed his wife.
The defendant told detectives the couple had met when teenagers, getting engaged when she fell pregnant at the age of 20.
They later had an on-off relationship, repeatedly splitting up and getting back together while his wife pursued an affair with a postman, the court heard.
Prosecutor John McGuinness said: "The defendant formed the opinion she was sleeping with other men."
Jurors heard Brockwell's DNA matched that found on blood stains on his wife's dressing gown, while tests also confirmed that blood under her fingernails was his.
Brockwell denies murder and the trial continues.