A mystery 'Danish' camper was staying in a tent close to the scenes of the murders of Saad Al-Hilli and his family in 2012 ...

Hilli, 50, along with his wife and mother-in-law were gunned down along with a local cyclist near Lake Annecy, eastern France ...

French investigators believe the shooter behind the 2012 Alps murders is an ex-Swiss special forces agent who “lost the plot” ...