Johnson said she resigned because she felt morally obligated to provide the new evidence she uncovered.
I left because I learned about this evidence when the public learned about it yesterday, late afternoon.
It included ammo taken from the scene.

Prosecutor Erlinda Ocampo JohnsonRoss D. Franklin - Pool/Getty Images
I came on the case towards the end of April, so I had to get up to speed.
I was not involved in the Hannah Gutierrez case at all.
I learned all of that yesterday.

She emphasizes her ethical and moral obligations as a prosecutor, which include ensuring all evidence is presented.
Discovering the withheld evidence, Johnson felt compelled to withdraw before the court hearing.
We dont get to decide what the defense is going to be.
What they do with it, thats up to them.
She added, Did I believe that there was some inappropriate behavior with regard to handling this gun?