In a press conference Thursday, Israel said the armed deputy, Scott Peterson, was on campus during the shooting but failed to go inside to engage the accused shooter, Nikolas Cruz.
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The decision to suspend Peterson was made after witness statements, video and Peterson's own statement, Israel said.
"What I saw was a deputy arrive at the west side of Building 12, take a position and he never went in," Israel added.
Instead of facing the suspension, Peterson decided to resign/retire.
Cruz is accused of killing 17 people in the nation's deadliest school shooting since a gunman attacked an elementary school in Newtown, Connecticut.
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