UK UK - Alistair Wilson, 30, murdered at home, Nairn, Scotland, 28 Nov 2004

[Konstantin]

None of this means the killing was job related (either directly or indirectly) but I would not rule it out either just as I would not rule out that something else in his private life triggered the killing.

I agree.
Something triggered the killing -- which might have been something the killer had imagined, and that made sense to him but not necessarily to anyone else including AW (if for example the killer was mentally unwell and reacting to a scenario that existed purely in his mind).
AW had just left his job so perhaps that was a trigger in some way.
The police suggested this might be a row over AW's objection to decking which some have dismissed as surely too trivial, but people have all sorts of triggers depending on their histories, state of mind, mental health. People do get very upset over matters that might seem trivial to others.
Basically we have no idea what happened. It's such a baffling case. Hopefully the case review will produce some real leads and get further with this. It must be agony for VW and her kids.