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In 1974, a 5-year-old girl disappears while walking to her friend's house; after 46 years, detectives are able to put the case to rest using modern DNA technology.

The case of Johnny Hincapie, whose conviction for the 1990 murder of a Utah tourist in New York -- a case that represented a tipping point in the city's law enforcement -- was overturned after 25 years.

A 29-year-old woman goes missing.

When a woman returns two days after being reported abducted, authorities believe it's a hoax until a similar crime forces them to take another look.