A man in his 20s died on board an Aer Lingus flight from Lisbon to Dublin on Sunday evening.
The Dublin-bound flight was diverted to Cork Airport after the 24-year-old became agitated about an hour into the two-hour journey.
He subsequently became unwell and then fell unconscious. The captain of the flight EI485 declared a medical emergency and diverted the plane to Cork, where it landed shortly after 5.30pm .
It is not clear when the man died but he was pronounced dead on board the airplane.
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Some 170 passengers and crew members were taken from the plane and interviewed by gardaí about the incident.
Gardaí in Togher, Co Cork are investigating the incident.