They thanked the search team in Ecuador and those who are assisting in bringing David's body home.
Among the rest of the group, U.S. citizen Jeremiah Stewart was rescued on Saturday while Ecuadorian kayaker Joaquin Meneses was discovered alive on Monday.
While the victims were all said to be experienced kayakers, who had travelled extensively, the fate of their expedition demonstrated the significant risks associated with adventure sports in isolated locations.
Call Of The Wild activity store, for which Mr McGourty was an ambassador, tweeted their sadness at the news of his death.
Galway native David Higgins, pictured below, remains missing.
Friends of Mr McGourty has described him as an "absolute gentleman" and an "outstanding young man" who had "the world at his feet".
The club added: "It is with profound sadness we announce the passing of club member and trainee-instructor Alex McGourty".
The club has said that Alex was a trainee instructor who died while fulfilling his dreams, kayaking in Ecuador.
Friends have also used Facebook to pay tribute to the young adventurer.
Sligo Kayak Club have paid tribute to McGourty, a passionate and "fine young man", via their Facebook page.
Mr McGourty posted last week on his Instagram account that he and the group had hiked six hours in the jungle into the "hidden upper Abanico" to go kayaking. "What a fearless and courageous young man". "His dad was so proud of his achievements in Kayaking and all he had done in the USA and overseas".
The Department of Foreign Affairs said it is aware of the cases and is providing consular assistance.
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Onnoghen ordered the Nigerian flags at Supreme Courts and other judiciary institutions to be flown at half-mast on Tuesday. A family member of the deceased, Hajiya Halima Sulaiman, confirmed the death in Kano, yesterday.
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He said he regretted that comment and tried to message her, but did not receive a response, police said. They interviewed two suspects with their parents' permission, and say both confessed to cyberbullying.