The parents of a Northern Irish teenager who died while on holiday in Bulgaria say they are "devastated" following his death.
Daniel Smyth, 19, from Coleraine in Derry, collapsed in his hotel bathroom on Sunday, and died instantly, Belfast Live reports.
His post-mortem has since found he had cardiac arrhythmia, an irregular heartbeat, that had gone undiagnosed and was a "ticking time bomb", his family have said.
