A hunter was seriously injured in the thorax this Sunday at the end of the morning.
The facts occurred on the edge of the forest, in Landricourt (Aisne), said the gendarmerie.
According to the first elements of the investigation, it would be a "hunting accident".
"The victim left for the hospital in Reims (Marne) in absolute urgency" and "the findings are underway to know the circumstances of this tragedy".
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The Laon gendarmerie company, criminal identification technicians and the search squad went to the scene of the accident.
Thursday, a 67-year-old motorist, seriously injured Saturday by a hunter a few days earlier on a road between Nantes and Rennes, had died of his injuries.