They should never have allowed him to fly.
When he boarded he was grey and sweating profusely ( probably 70 years old and about 20 stone)
Sat right at the front so all passengers (including kids) watched an hour of chest compressions on the floor
Continuing back to Gatwick with him was not an option - getting him back in his seat would have taken a forklift.
A very sad and distressing experience but I suppose he was nearer heaven when he died