American woman Molly Martens-Corbett, who was convicted of the murder of her Irish husband Jason Corbett, has had four years added on to her sentence.
Following a custody hearing on 1 August, her projected release date was changed from 8 March 2037 to a date in 2041.
Since entering prison, she has been cited for three separate breaches of the rules, twice in one day in February.
A spokesperson for the North Carolina Department of Public Safety explained that likely good behaviour was taken into account when Martens-Corbett's projected release date was originally calculated, and that this had been reconsidered following her recent prison rule infractions.
Last summer Martens-Corbett and her father, retired FBI agent Tom Martens, were convicted of the second-degree murder of father-of-two Limerick man Jason Corbett.