The tragedy happened at Jackson’s Hotel in Ballybofey on Saturday night.
It is understood that the man from Omagh died at around 10.35pm while on the dance floor at the hotel.
There were frantic scenes as wedding celebrants tried in vain to revive the man.
There was no-one available at Jackson’s Hotel to comment on the man’s untimely death.
The man was prayed for at a local Mass yesterday.