5 September, 2012: Saad al-Hilli, 50, his wife Iqbal, 47, and mother-in-law Suhaila Al-Allaf, 74, along with French cyclist Sylvain Mollier, 45, are all killed in a lay-by near Chevaline. Their bodies were discovered by former RAF pilot Brett Martin.
17 September, 2012: French police begin probing theory that Mr Mollier, who worked in the nuclear industry and specialised in zirconium metal-working for nuclear reactors, was the main target of the killing.
November 2012: French detectives examine theory the family were killed by a serial killer with a hatred of tourists. They linked the deaths to the murder of Xavier Baligant, 29, in July 2012. He was shot four times at a rest area near Nancy while he was heading home to Belgium following a camping trip.
June 24, 2013: Mr al-Hilli's brother Zaid is arrested in connection with the murders.
October 2013: Zaid al-Hilli publicly protests his innocence and offers to take a lie-detector test to verify his own account.
November 4, 2013: Police release the first picture of a unnamed motorcyclist with a goatee who was seen