Wess Roley, 20, was found dead with a gun nearly six hours after the attack, and investigators say he acted alone, according to the Associated Press.

The suspect who allegedly ambushed firefighters on the job in Coeur d'Alene, Idaho, had contact and discussion with first responders before shooting at them with a shotgun, killing two of them and critically injuring a third,

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.