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Dr. Metzner: "The breakup of his girlfriend did not cause him to do this."
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"The realization that going to graduate school wasn't going to fix his brain," may have been a factor that triggered a psychotic break, or it could have nothing to do with it, Dr. Metzner said.
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Dr. Metzner agreed "the psychosis caused the shooting."
@Suzi The defense claims that the shooting would not have happened if not for the gunman's mental illness. This is another attempt to make that point.
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Dr. Metzner said he thinks the gunman went to graduate school because he sensed something was wrong with his brain and he hoped to study it and fix it. Says the mental illness was very "disturbing and distressing to him."
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Dr. Metzner: "I think his actions on July 20, 2012 were a direct [result] of his mental illness."
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Dr. Metzner: "I can come up with no other explanation for what he did... his mental illness impacted his judgment."