MISSOULA, Mont.—A 19-year-old Montana firefighter was killed while fighting a forest fire Wednesday.

The Missoula County Sheriff's Office identified the man as Trenton Johnson of Missoula.

Johnson was employed by Grayback Forestry who said he was killed fighting the Florence Fire in the Lolo National Forest.

Reports said the man died after being struck by a falling tree.

According to the company, he was working at the fire with a 20-person attack crew fighting a fire at the Seely Ranger District of the national forest.