i don’t like talking about this in public due to the safety risk, but it’s also very easy in the united stages. you just need paper pen, white out and a fax machine. most death certificates are easily available online. perhaps i restored some of your faith in humanity. Deading someone isn’t more common
Most jurisdictions (US and otherwise) have moved to Electronic Death Registration Systems. There was a fun Defcon talk about "killing" people with them a few years ago - https://www.youtube.com/watch?v=9FdHq3WfJgs
And apparently a big problem if someone fat fingers your SSN and kills you by accident. Most systems aren’t design to unkill you to correct the mistake.