(St. Paul, OR) -- St. Paul is mourning the death of one of its firefighters. St. Paul volunteer firefighter Austin Smith was killed yesterday morning while battling a barn fire. Officials say he was airlifted to OHSU but did not survive. Smith was critically injured when an explosion occurred in the three-alarm fire. Smith had served the St. Paul volunteer fire department for seven years. His colleagues say he was heavily involved in the community and was well-known around St. Paul. An investigation into the cause of the blaze is underway.