this morning, we focus on the case of army staff sergeant morgan robinson.her says the military handling of her daughter's assault ultimately led to her death. she spoke with cbs evening news anchor norah o'donnell as part of her exclusive investigation. >> reporter: morgan robinson knew from a young age she wanted to join the military. >> when she turned 21, she said mom, i have to talk to you. and she told me then she had joined. >> reporter: she had been in the national guard six years when sent on first deployment to kuwait in 2016. what happened when she was abroad? >> in kuwait she was sexual assaulted and tingcontinually harassed by one of her superiors. >> did she report it? >> yes. >> what was the response when she reported it? >> nothing. she got nothing. >> reporter: on the same deployment, morgan was sent to afghanistan where she was sexual assaulted again. an alleged gang rape involving multiple fellow soldiers. >> do you think she was afraid to report what happened in afghanistan? >> yes, ma'am. she was very scared. >> why do you think she was