A shocking doorstep video captures the terrifying moment before Elvia Espinoza, 46, a beloved elementary school teacher, was killed by her pre-med student son.Emmanuel Espinoza, 21, was seen hiding a knife behind his back as he attempted to open his mother's door on Saturday afternoon, as shown in the disturbing footage released by the Polk County Sheriff's Office.The student, dressed in light blue jeans and a navy-blue shirt, casually approached the front door with one hand concealed behind his back.
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