Based on the Stephen Gately autopsy report, it was confirmed that Gately suffered an acute pulmonary oedema - or sudden build up of fluid in the lungs - thought to have been caused by a heart attack.

Stephen Gately - Stephen Gately Autopsy Report
Gately's family said that they felt 'vindicated' by the finding, and announced his funeral would take place on Saturday at St. Laurence O'Toole's Church in Dublin.

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