First time posting although I've been reading this thread since August.
My lovely dad died suddenly and unexpectedly on 1 August. He was, as far as we were concerned, fit and healthy, even if he was 86. We thought he'd go on forever - or at least another 5 year, if not 10 or 15 (his aunt lived to 102). He was still "tall", articulate and funny, if that helps get a sense of the man.
He'd had a UTI but the dipsticks were clearing and he'd had a pacemaker fitted last year (went in to check out an irregular ECG and had CD a pacemaker fitted the same day
). He had an Apple Watch which would've warned me (I live 25 minutes away but he's got good neighbours I could've alerted) but he was not wearing it when he went through to his kitchen to make his morning cup of tea
and was discovered by his neighbours a few hours later
(who'd agreed a signal with him that if he hadn't opened his bedroom curtains by a certain time....
).
He wasn't long back from 6 weeks in SA when he died 
It would've been his 87th birthday on Christmas Day
. In a funny way, the day itself was not upsetting as he was so often in South Africa in recent years with his lady friend (he was originally South African and reconnected with an old Uni friend after my mum died over 11 years ago and who'd known mum and dad at Uni and knew they'd been a golden couple) or with my brother who lives in France, so we were used to him not being around. But both dh and I are feeling the hole more now: we'd have shared stuff with him, whether by FaceTime or by WhatsApp.
And we can't look forward to seeing him again when he gets back from his gallivanting in SA 
I know he went the way that he wanted: quickly and without fuss. But it still hurts 