Here in the UK death are registered in the region the person died in. This many be where he/she lived or may be further away if he/she did in hospital or away from home.
I would suggest you search Google for his/her local Registrar's office and if not successful search the surrounding areas.
Bear in mind the local Registrar will notify the Superintendent Registrar in the months of January, April, July and October of deaths in the preceding three months. This could mean a late 2020 death is only just appearing on the Superintendent Register Records and will not be on the GRO indexes for a while.
Cheers
Guy