A teenager was bludgeoned to death the night before Halloween in 1975. A Kennedy cousin was arrested - and then exonerated

On the night before Halloween, 15-year-old Martha Moxley went out with her friends for a traditional “Night of Mischief” in her affluent Connecticut neighborhood. Her slain body was found the next day but it took decades for a conviction, which was later overturned. Andrea Cavallier explains how the murder is still unsolved nearly 50 years later