Spoilers from the movie - Knives Out (2019). I want to investigate if the movie's plot operates correctly regarding the legal principle in question - Slayer Rule.
Millionaire Harlan Thornby bequeaths his entire estate to his nurse (but she doesn't know this). One night, she accidentally administers him a fatal dose of morphine. She looks for the antidote but cannot find it. Harlan Thornby would die in 10 minutes because there is no antidote. He sends her away and asks her to pretend everything is alright. And then slits his own throat with a knife and dies. His body is discovered next morning and the will is read.
Question: Was his throat-slitting necessary to protect the nurse from being disbarred from his inheritance? Does the throat slitting help or is she still disbarred?