5x19 - Cold Case Files

After U.S. Navy sailor Andrew Muns disappears in 1968, the Navy claims that Muns went AWOL from his ship. But his sister works tirelessly for over 30 years to prove that Muns was really killed. And DNA surreptitiously gathered from a cigarette butt helps detectives to unravel a 20-year-old case of rape and murder.