A woman blasted her husband with his shotgun and then killed herself in the bath, an inquest heard on Friday, 15 October.
The bodies of wealth Paul Laithwaite, 64, and his wife Jean Laithwaite, 65, were found dead at their luxury home at Sealand on the Wales Cheshire border in January.
Mr Laithwaite had catastrophic head injuries and his wife was slumped in the bath.
North East Wales coroner John Hughes described it as a mind numbing tragedy.
Two of their three sons discovered what had happened when they went to the house after their calls remained unanswered.
The inquest at Flint heard how Mr Laithwaite had been shot to the head with his own 12 bore double barrelled shotgun as he lay asleep in bed.
His wife had then taken a cocktail of prescribed drugs and alcohol and had slumped forward in the bathwater, which restricted her air ways.
What caused the tragedy remains a mystery although the inquest heard that Mrs Laithwaite was depressed following the death of her father.
On the kitchen table police found a bible which had a note inside with her name on it.
It read “My soul is full of sorrow to the point of death.”
The corone recorded a verdict of unlawful killing on the husband and suicide on the wife.