camera Schumacher was wearing will provide some clues, as will footage by a 35-year-old German steward who says he was filming his girlfriend on the slopes when by chance he captured the moment when the retired driver fell.
In the background, a skier is seen descending an unmarked run between two groomed pistes before falling, the German news magazine Der Spiegel reported.
According to the witness, who spoke to the magazine, the seven-time world champion was descending the slope at a "leisurely" pace -- "a maximum speed of 20 kilometres an hour". He plans to hand over the footage to French investigators.
This would corroborate claims by Michael Schumacher's spokeswoman Sabine Kehm, who has said he could not have been going fast "because it appears he helped a friend who had just fallen".
But in a press conference last week, doctors who treated Schumacher said he had been skiing at great speed when he fell.
Michael Schumacher won more Formula One titles than any other driver and enjoyed 91 Grand Prix victories between 1994 and 2004.