Dawn Boldrin, a teacher who witnessed Brandon McInerney shoot gay student Lawrence King, has quit teaching.

McInerney is the 17-year-old boy who shot King, 15, twice in the back of his head during a morning computer lab at E.O. Green Junior High School in Oxnard, California. King liked to say he was gay, wear makeup to school and taunt boys.

Last week, jurors deadlocked on whether McInerney, then 14, deserved to be convicted of voluntary manslaughter or first-degree murder.

On HLN's Dr. Drew, Boldrin discussed the emotional toll the murder has taken on its witnesses.

“I can't even imagine what those children...” a tearful Boldrin told Dr. Drew. “I know people tend to have this idea, 'Oh, they're kids, they'll get over it.' And I've been, I think compounding on me, is the stress I've had over worrying over those kids, because they weren't treated right.”

“I didn't even see him pull the gun. I was on the other side of the classroom working with another student. And I think out of the side, I might have seen an action. But I definitely heard the shot and smelled – you could smell it, it was just like fireworks.”

Boldrin added that she is no longer teaching. (The video is embedded in the right panel of this page.)