In November, police released an image of a male motorcyclist they wanted to speak to in connection with the killings.
The French Gendarmerie released an artist's impression of a motorcyclist who was seen riding in the area shortly before the four murders took place.
The man's helmet was said by Mr Maillaud at the time to be "very particular" and one of only a few thousand models worldwide, with a bottom section which opened laterally to reveal the lower face.
Read more: Man arrested over Alps killings
More top news
Bono said the death of Dennis Sheehan, who had been the band's manager for more than 30 years, was like "losing a family member".
Up until today Zurich has always been a safe haven for Fifa - an island could behave just how they wanted. Yesterday changed everything.
Prime Minister plans a whistle-stop charm offensive with EU leaders this week.