Who killed Kate Brown and Carnell Sledge? The two longtime friends were gunned down in broad daylight while sitting on a bench in the Cleveland Metroparks. Five years later, the murders remain unsolved. In this episode, 19 News anchor Nichole Vrsansky sits down with police and the FBI as they go through the evidence in the case, persons of interest, and the latest developments in their investigation. You'll also hear from the families of "Nell" and Kate as they share memories and discuss their theories about what may have happened. A $100,000 reward is available for information that leads to an arrest in this case. Tipsters can reach out anonymously to the FBI's Cleveland Field Office at (216) 622-6842, the Cleveland Metroparks Police Department at (440) 331-5219, or Crime Stoppers of Cuyahoga County at (216) 252-7463. Tips can also be submitted at tips.fbi.gov.