UMMM guys.
The devil had not yet entered the story of the bible when this happened.
The SERPANT told eve this.
Not the devil.
all these answers so much more complex than it is!
The bible later goes on to proclaim that from hence forth eve's children and the serpants children were therefor and evermore be enamies.
Now the devil didnt make eve do it (what a cliche`!)
Eve did it because the serpant convinced here that God was lieing.
Which if he was or not isnt sure.
It didnt KILL Eve or Adam.
But they did lose thier spiritual ties to God and were cast from him so in a way that would have been a type of death.