The trial is underway of a 20-year-old woman accused of stabbing to death another woman in Laytown, Co Meath, less than a year ago.
Kelly Noble, with an address at Seaview in Laytown, denies murdering 19-year-old Emma McLoughlin outside a supermarket in June 2006.
Anthony Salmon, for the State, in opening, told the jury that 19-year-old Ms McLoughlin died as a result of a penetrative knife wound to the chest.
It is the State's case that a dispute took place outside Pat's Supermarket in Laytown between the dead woman and the accused after 9pm on June 2nd last year and the person who started it was Emma McLaughlin.
Mr Salmon said Ms McLoughlin was clearly upset about a previous incident between herself and the accused.
The owners of the supermarket came out and tried to intervene, but the dispute continued and the mother-of-two was stabbed and died.
No one actually saw the stabbing, according to the State, but there is enough evidence to prove the accused did it.
Ms Noble denies a charge of murder and one of producing a knife during the course of a dispute or fight.