Having picked up an injury in the Matron Stakes on Saturday at Leopardstown, connections had been awaiting the verdict as to the damage which had occured to the Jessica Harrington stable-star.
The race did not go according to plan for the daughter of Mastercraftsman, and as she prepared to make her challenge, looming up to challenge the eventual winner Laurens, it appeared that she took a slight stumble, and thus failed to close any further on Karl Burke's stable star.
Post-race, she was reported to be clinically abnormal and it has since been reported that she had suffered a fetlock injury in the race. Resultant of this, the Jessica Harrington-trained 3-year-old filly was taken to Fethard Equine Clinic for further examination.
Alan Cooper, racing manager to her owners, the Niarchos family, discussed on Sunday: "She was fine when she got to the vets last night, but they were going to give her a good examination this morning.
"She appeared to take a false step and was sore afterwards. It was unfortunate, but she was very brave - she was still trying to win."
Since that interview was conducted on Sunday morning, it has since been confirmed that Alpha Centauri has been forced in to retirement.
More sad news also emerged shortly beforehand, as the 2018 2000 Guineas winner Saxon Warrior, was also confirmed to be retired by Trainer Aidan O'Brien.