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.

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.

Two firefighters were killed and a third wounded Sunday when they were shot as they responded to a wildfire on an Idaho mountain that was set to lure them into an ambush, authorities said.A tactical response team used cellphone data to zero in on a wooded area where they found the body of what's believed to be the lone suspect and a rifle nearby as flames were rapidly approaching,