Can you help me please, i can’t remember

Hello guys. I remembered a scene of a film but i can’t remember the name of the movie.
The scene was:
An old man was suffering from alyzheimer and diabet. And his wife was trying to kill him.( i’m not sure)
And he asks his wife that if he took his insulin and his wife says no. So he took his insulin again and again and then he dies because he is alyzheimer and he can’t remember it.
This is the only scene i remember and it stucks in my head lately please let me know if you know the movie!