A 10-year girl witnessed her mother murdering her father, it was claimed in court on Wednesday.
Jayne Lovegreen is said to have confronted her husband John with a kitchen knife just months after the couple separated and he moved out of their farm in County Durham.
The prosecution at Teesside Crown Court in Middlesbrough claimed the deadly assault took place after he began seeing another woman.
Mrs Lovegreen, 34, of Greenfield Farm, High Etherley, near Bishop Auckland, allegedly attacked him after collecting their daughter from a weekend access visit with her 35-year-old husband. She denies murder.
The court was told that Mr Lovegreen's body was found in a cottage at Baal Farm, Wolsingham, County Durham, on 6 July, 2002.
Franz Muller QC, prosecuting, told the jury: "The defendant had become suspicious of the nature of his relationship.
"She left her home in her car armed with a kitchen knife and possibly, two hours later, entered his cottage with the knife secreted in the top of her boot.
"When she was confronted by him, who at most pushed her and who was unarmed, she drew the knife in the presence of her daughter and stabbed him.
"The attack with the knife was, in our submission, carried out in anger and jealousy and she left him dying or dead before driving off."
The court was told how the couple's daughter, also called Jayne, left the house when the attack started to tell a neighbouring farm owner.
The court heard the couple met as teenagers and attended an agricultural college. They married in October 1990 and running a farm in the County Durham area.
The jury was told that the couple had a stormy relationship at times in which Mrs Lovegreen showed aggression towards her husband including one incident in which she hit him with a pan of water, scalding his back.