and i hope one day to have the opportunity to tell them that they had a great mother. >> reporter: samira's youtube videos are still online, of online, of course, unkillable artifacts of a broken dream and a life that was passionate and beguiling and brief. i'm natalie morales and this is "dateline." >> they told me that this vehicle had gone off the road, and into this creek bed. >> she was face-up in about ankle-deep water. >> she's got severe injuries to her head. >> little did you know the mystery that was about to unfold. >> i go into the living room and i see blood all over the place. i went into the bathroom. there's more blood. >> the whole time we're thinking