The two men killed in a March 7 fire at a Denver construction site began their trades as teenagers and were hired onto bigger projects through hard work and craftsmanship, their families said Tuesday. Dustin Peterson, 37, started working with an electrician during summer breaks as a teenager and translated his math skills into a challenging profession, his parents told The Denver Post in an interview. Roberto Flores-Prieto, 29, found a job with an insulation company shortly after he immigrated to the United States as a 16-year-old, said his wife, Evette. Photo courtesy of the Peterson familyDustin Peterson, a 37-year-old electrician who died in the March 7 fire at a construction site on Emerson Street in Denver.Photo courtesy of the Peterson familyDustin Peterson, a 37-year-old electrician who died in the March 7 fire at a construction site on Emerson Street in Denver.