Why did initial investigators dismiss the death of 23-year-old nurse Cassy Farrington as potential suicide without proper investigation? Keith Morrison and producer Cassandra Marshall discuss their Dateline episode on how family determination and a second investigator uncovered critical evidence in a domestic violence case dismissed by Silver City police. The initial investigator suggested suicide immediately at the crime scene without conducting basic evidence collection, including failing to drain the bathtub or photograph the broken towel rack in the second bathroom.