A teenage girl disappears on her way to visit friends. As police retrace her last known movements they uncover a terrifying possibility, the 16-year-old may have been kidnapped by an international human trafficking ring. Join us for On the Case with Paula Zahn tonight at 10/9c. | Investigation Discovery

June 4, 1999. It was a warm afternoon in Washington D.C. when police were called to a home in the city's Capitol Hill area. When officers arrived at the scene, they discovered the bloody, lifeless body of 51-year-old Dennis Dolinger, lying in his basement. Dolinger had been stabbed multiple times in the head and although police couldn't find a murder weapon, the pattern left in the wounds appeared to have been made by the tip of a phillips head screwdriver. Blood evidence at the crime led upstai

When a young woman is found shot to death in her home police are baffled. Then a cryptic letter from a mysterious source sends the investigation down a twisting road to the truth. On the Case with Paula Zahn begins Sunday at 10/9c. | Investigation Discovery