They used dental records to confirm the victim is 18-year-old Nickolas Harris.
On February 16th, railroad employees reported finding a man badly injured near some train tracks.
This was in Casa Grande near Jimmie Kerr Boulevard and Casa Verde Road. The man was flown to the hospital for treatment and died a few days later.
Authorities believe he somehow boarded the train in the Tucson area and then either jumped or fell off near Casa Grande.