Special Agent Larry E. Boles, 29, was killed on the night of July 9, 1977, while working the Union Pacific rail yards in downtown Denver. According to the record, Boles interrupted a burglary, captured one suspect, and radioed for help; before backup arrived a second man slipped up behind him and opened fire. Boles was mortally wounded at the scene and pronounced dead that night.

Investigators say the shooter fled into the yard and surrounding industrial blocks and was never apprehended. Union Pacific posted a $5,000 reward in the days after the killing as detectives chased tips, but the case remained unsolved and Boles’s death appears on Denver cold-case and memorial lists as a line-of-duty homicide. Memorials note he had served about a year with the railroad police and left close family.

Did anyone who worked the Denver railyards in 1977 or who remembers the aftermath have information that could help close this case?