In the wake of the deadly ambush on responding firefighters in Coeur d'Alene, Idaho, the suspect's grandfather spoke to ABC News on Monday.

Two firefighters were shot dead and a third wounded on an Idaho mountain when they were ambushed by a man who set the fire to lure them to the area, the local sheriff says.

The suspect, who died on Sunday and was found with a firearm nearby, was a 20-year-old man, according to a law-enforcement official.