According to Radio Mont Blanc, he was skiing with a group of six people on the Glacier du Tour, at Col du Passon (3,028m), when he suffered a cardiac arrest.
The alert was given in the morning, at about 7:50am. The Chamonix PGHM was dispatched to the scene with a doctor from Mont Blanc Hospitals on board the civil security helicopter. But sadly, the victim was declared dead at the scene.
The skier's body was transported to the Drop Zone (DZ) of Bois.
The Col de Passon
The Col du Passon (3028m) can be reached by midday from the Grands Montets, with a great descent mostly on glacier, to the small mountain village of Le Tour (1,450m).
The route starts from the top of Les Grands Montets cable car rising from the village of Argentière near Chamonix. Take the cable car to Lognan and then take a second cable car to the top of Les Grands Montets. Go left down the Rognon glacier keeping to the right of the rock and onto the heavily crevassed Argentière glacier. This is an awesome ski itself with just under 1000m of descent.
Traverse the Argentière glacier and the ski-tour starts with a skin up along the snow covered moraine slopes to the left (North) of the aiguille du Chardonnet.
Skin up about 750m towards the Col du Passon, before a short steep bootpack section up to the Col itself, then take a break at the Col before beginning the descent.