Police say they are investigating the death of a 29 year old man at an address in Llanrug near Caernarfon.
North Wales Police say they called just after 4pm on Monday.
The circumstances of the incident are still being investigated and it has been referred to the North West Wales coroner and the Health and Safety Executive.
A post mortem is expected to be conducted today.
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Wales have qualified for the Euro 2016 quarter finals after beating Northern Ireland 1-0 in Paris.
A rally has been held in Cardiff following the EU referendum to show support to migrant communities.
It's 0-0 at half time in Paris as Wales face Northern Ireland in the last 16 of Euro 2016.