In February 2013, 21-year-old Kelsie Schelling had just learned she was eight weeks pregnant. Hours after her first prenatal appointment, she drove from Denver to Pueblo -  and was never seen again.

Kelsie’s body has never been found. But years later, someone was convicted of her murder. How do investigators build a case without a body? And after more than a decade, is there still a chance of finding Kelsie?