Police shoot & kill 20 year old Hispanic man—after family told them he was having mental health crisis.
He was trying to harm himself with knife—nobody else.
"I should've never called for help," his aunt said.
"If they were just going to shoot him."
"He's mentally unstable... he wasn't trying to hurt the police whatsoever—he never pointed the knife at them."
Police issued a statement saying that Johnathan Delgado ignored commands to drop the knife—then walked toward them.
Chief said that the officers involved are under "administrative review."
Incident occurred in a back alley of north-central Phoenix, Arizona.