Frantic, Carter called 911 around 8:00 p.m. on Aug. 14 to let them know that after letting himself into her apartment, there were no signs that Markham had been there since he saw her last.

WLWT Investigates and Dateline are working together to bring never-before-seen interviews and exclusive new details into the disappearance and death of Katelyn Markham. In July, after 13 years ...