Gregory: The smiling boy whose murder haunted France for decades

The 36 years since four-year-old French boy Grégory Villemin died have been marked by revenge, dashed hopes, anonymous taunting phone calls, and mystery. With the case back in the headlines, we look at France's most haunting unsolved murder.

Who’s Grégory Villemin?

He was a four-year-old boy found drowned in the Vologne river near Docelles, in eastern France in October 1984. His unsolved death is the country's most high-profile unsolved murder cases.