An 11-year-old girl took ill and died following a school swimming trip in Ballymena.
Naomi Fulton, a pupil at Ballymena Academy, took ill at the end of a scheduled lesson at the Seven Towers Leisure Centre.
Ballymena Academy principal Ronnie Hassard said pupils and staff were stunned by the death.
"The thoughts and prayers of everybody associated with the school are with her family, Mr Hassard said.
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"She took ill unexplained and there is no suggestion of any accident."
He said a a special Act of Respect will be held in the school today for pupils in Naomi's year.
Police said they were working with the coroner following the death.