Sister remembers security guard shot and killed in SF's Japantown as kind and nurturing

A 15-year-old is in custody, accused of shooting and killing a security guard in San Francisco Japantown on Wednesday. A second boy, accused of helping him, is also in custody. The 40-year-old guard has been identified. His sister says he was escorting the teen suspect out of the mall. He had a gun and opened fire. She describes her brother as kind and nurturing.