The suspect who police believe killed two firefighters Sunday after igniting a brush fire in Idaho with a flint fire starter wanted to pursue a career as a firefighter himself, his grandfather told CNN.

Wess Roley, 20, was identified by a law enforcement official as the suspect in the shooting in Coeur d’Alene, Idaho, which left two firefighters responding to the blaze dead and injured a third. Authorities said Roley was found dead at the scene, and appears to have shot himself.

Roley’s grandfather, Dale Roley, told CNN his grandson came from a family of arborists and had been working in the tree service industry while trying to figure out his career path.

Police say Wess Roley opened fire on the first responders from a tree, citing extensive experience climbing with his family. His motive remains unknown and no manifesto has been found.

“He wanted to be a fireman – he was doing tree work and he wanted to be a fireman in the forest,” Dale Roley said. “As far as I know, he was actually pursuing it.”