The cyclist shot dead in the Alps may have been the main target of the massacre, French police say, not the British al-Hilli family.
Investigators made the extraordinary claim as Sylvain Mollier, who worked in the nuclear industry, was temporarily buried in a secret ceremony yesterday.
This went against the wishes of the 45-year-old's family, who had asked for him to be cremated.
It is believed forensic experts still want to examine his body for clues, which would have been impossible if the remains had been destroyed. French investigators are examining the theory that he may have led a double life and been the intended target of the shooting.
Until now the investigation had focused on the deaths of British aerospace engineer Saad al-Hilli, 50, his wife Ikbal, 47, and his mother-in-law Suhaila al-Allaf, 74, who were shot in the countryside near Annecy in their BMW estate car.