Mystery still surrounds missing 2-year-old, dead mother found in San Francisco park

Arianna Fitts was last seen with babysitters in February 2016. Two months later, the body of her mother, 32-year-old Nicolle Fitts, was found in McLaren Park by Recreation and Park Department workers. She had been buried in a small, shallow grave, curled in the fetal position and covered with plywood.