An investigation into the death of a man who was fatally hit by a train in Fairfield continues. 42-year-old Mark Dean Kneeskerm was struck and killed early Sunday morning at a railroad right-of-way. His last known address was in West Des Moines. Investigators have not identified all the people who had contact with Kneeskerm during his visit to Fairfield, and they are now trying to determine what he was doing before his death. Anyone with information is asked to call the Fairfield Police Department.