What is the difference between "fridging" and the standard "X character dies from the development of Y"?

I was trying to rewrite an old scene for the main character in my story. Simply put, in this scene Bob murders / abuses his friend (not his real name, of course), but she can't prove Bob's crime, so instead he incriminates him for another crime and punishes him for it . This event changes her a lot as a person and defines her most underlying features. However, for some people this may be seen as an example of frustration, but honestly it is really difficult for me to distinguish that from a normally written character death. What is the difference between the two and what are some things I should keep in mind when trying to develop a character through the death of a secondary character?

I was trying to rewrite an old scene for the main character in my story. Simply put, in this scene Bob murders / abuses his friend (not his real name, of course), but she can't prove Bob's crime, so instead he incriminates him for another crime and punishes him for it . This event changes her a lot as a person and defines her most underlying features. However, for some people this may be seen as an example of frustration, but honestly it is really difficult for me to distinguish that from a normally written character death. What is the difference between the two and what are some things I should keep in mind when trying to develop a character through the death of a secondary character?

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