Tributes have been paid to 24-year-old Ellen Cassidy who died in hospital after becoming unwell at the finish line of the Cork City Half Marathon.
Ms Cassidy became ill at about 1pm on Sunday after she had finished the half marathon.
She was tended to at the scene by medics before being transferred to Cork University Hospital.
She was pronounced dead a short time later.
Ms Cassidy was a champion swimmer who joined Dolphin Swimming Club in Mayfield on the northside of Cork city when she was nine years old.
In a post on Facebook, the club said that Ms Cassidy made a tremendous impression on everyone she met.
"Ellen swam through life with grace, strength and passion.
"Your smile and your drive will never be forgotten. Our deepest condolences to all the Cassidy's family and friends."
Ms Cassidy was very much loved at the club not only for her talent in the water but for her kind and giving nature.
Seven years ago when she represented Ireland in Luxembourg, the club said that they "couldn't be prouder" of her.
They also described her as a "positive role model" for all their young swimmers.
Swim Munster described Ms Cassidy as an "inspiration to everyone she met" and said she was dedicated to swimming.
Sunday's Well Swimming Club said her "spirit, dedication and friendship" had an impact on everyone that knew her, while Mallow Swans Swimming Club said she represented swimming "with grace and passion" and Streamline Swim in Cobh said she would be remembered as a "kind soul".
Lord Mayor of Cork Councillor Dan Boyle offered his sincere condolences to Ms Cassidy's family and friends.
"Our thoughts are with you at this difficult time," he said.
Ms Cassidy had competed on behalf of her club, Munster and Ireland.
She had represented Ireland at the European Youth Olympics and the European Junior Championships.
She had also been on a UCC Emerging Talent programme and represented Ireland at international schools level.
Meanwhile, Deputy Lord Mayor of Cork and Green Party councillor Honore Kamegni posted on X that it was with "deep sadness" that he heard of the passing of Ms Cassidy.
In a statement, the marathon organisers said that they were deeply saddened to confirm that a participant in the marathon had passed away.
"The person was attended to immediately by the emergency services on the scene. Our deepest condolences go out to the family and friends of the deceased."
A number of road closures were in place to facilitate the running of the marathon. Ambulance crews were in situ at the marathon.
Volunteers from the Cork City Civil Defence and Cork West Cork Civil Defence were also on hand as were members of the Irish Red Cross.
More than 11,000 runners took part in the Full Marathon, Half Marathon and 10K events.
