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      4/4: Army downplays mental illness as cause of attack; Hospital greeter finds purpose after cancer diagnosis

      |Ivan Lopez, who opened fire on fellow soldiers at Fort Hood, complained to military doctors that he suffered a traumatic brain injury, but investigators said they had yet to find evidence that backs up the claim; and, Steve Hartman meets Jon McAlpin, who works as a front-door greeter at an Omaha cancer center.

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