A lottery prize of £116,304 remains unclaimed in the Ballymena and Antrim area since December.
The winning ticket, purchased in the boroughs of Antrim and Ballymena, matched five numbers and the bonus ball in the Lotto draw on December 18, 2013.
The winning Lotto numbers on that date were 2, 7, 25, 35, 40, 42 and the bonus ball was 13. The lucky ticket-holder has until June 16, 2014 to come forward and make their claim.
If no one comes forward with the winning ticket before the prize claim deadline then the prize money plus all the interest it has generated will go to the National Lottery Good Causes.
A National Lottery spokesman said: "We're desperate to find this missing ticket-holder and unite them with their winnings – this really could be the best way to celebrate Valentine's Day and show your partner how special they really are."
With all National Lottery draws players have 180 days from the day of the draw to claim their win and should call the National Lottery Line on 0845 910 0000. Anyone concerned about lost or unchecked tickets may like to consider either setting up a National Lottery Subscription or playing online at www.national-lottery.co.uk. For more information call 0845 912 5000 or visit www.national-lottery.co.uk.