gratitude that he was in my life, even for a brief moment in time. i'm craig melvin. i'm natalie morales. this is dateline. >> our hearts break for this mother. people don't randomly disappear. >> she was a design original. christina. a fashionista. >> the most fantastic wardrobe. >> it was news nationwide when she vanished. >> she went out for drinks with friends, never came home. >> i said, something's wrong. >> we realized, this is real. >> who was the last to see her? >> i don't know where she went. >> where was her ex model boyfriend?