Rayleigh Bath Chair Murder - Hector parallels
I listen to true crime podcasts and this came through in my feed recently.
https://en.wikipedia.org/wiki/Rayleigh_bath_chair_murder
Summarizing - a man killed his wheelchair bound father by planting an anti-tank mine under his seat. The father was a very difficult man who abused his wife and also had a bell that he rung often to get attention.
I wonder if VG took inspiration from this real life murder.