A caretaker had "no intention" of harming the wife he killed when he followed her out into a Berkshire school car park, a court has been told.
Mr Hunt said he had no intention of killing his wife Donna
Stephen Hunt sobbed as he admitted that he had lashed out at Donna, his wife of 17 years, at Forest School, Winnersh.
Mr Hunt, of Church Close, Winnersh, Berks, was giving evidence in his defence on the third day of his trial at Oxford Crown Court.
The 45-year-old admits manslaughter, but denies murder.
Mr Hunt repeatedly broke down and struggled to breathe as he was first questioned by his defence barrister Oscar Del Fabbro and then by prosecutor Jonathan Price.
The jury heard how Mrs Hunt, a lab technician at the school where they both worked, had woken up after a nap on the Sunday afternoon she was killed and began to argue with Mr Hunt.
He told the jury: "She said she did not like my mother, she had never liked my mother.
"I said to her that she had just woken up and that she had been out all night on Friday night, she had been in bed all day on Saturday and had been drunk all of Sunday.
"I said, 'please don't start as soon as you wake up'."
He said his wife asked him to follow her outside as she did not want to disturb the children.
Asked what his intention was in following her, he said: "I had no intention, just to listen."
Once outside and in the school grounds adjacent to their home, he said she accused him of not helping around the house and of only wanting to look at pornography and play poker on the computer.
"She said she was having sex with one of our friends, but not just sex," he told the court.
Mr Hunt said he reached out for an iron bar he saw lying on a pile and hit her with it.
Mr Price, prosecuting, asked him: "When you hit your wife, did you intend to kill her?"
He replied: "No."
"Did you intend to cause her really serious injury?" asked Mr Price.
"I don't know," he replied. "Maybe, maybe not."
The trial continues.