Promising Irish rugby player Nevin Spence was killed in a farm accident on Saturday.
The 22-year-old, who played centre for Ulster, had been brought into the wider training group for the Ireland team during this year's Six Nations, although he had not made his full debut.
He had played three games for the Ireland Wolfhounds, the second tier side.
Spence was killed when he, two other men and a woman - who were reported as being his father, older brother and sister - fell into a slurry tank on their family farm in Northern Ireland.
All four were pulled out of the tank after a lengthy rescue operation, but the three men died, with the woman taken to hospital for treatment for the inhalation of fumes.
Spence had played for the Ulster Ravens against Munster A on Friday as he worked his way back to full fitness after an injury-hit start to the season.
Northern Ireland First Minister Peter Robinson said on Twitter: "Deeply saddened to hear of the tragedy in Hillsborough this evening. My thoughts and prayers are with family at this time of devastation."
Ulster fly-half Ian Humphreys wrote: "Devastated to hear the news about Nevin Spence and his brother and dad. Prayers with all his family... RIP Nev, you'll never be forgotten..."
Former Ireland and Munster hooker Jerry Flannery added: "Terrible news on Nevin Spence, his Brother and their Dad. Offering up prayers for their family and friends, unbelievably sad."