Construction crews headed back to work on Tuesday, a day after a driver for a steel company died when rebar fell on him at the construction site of Levi's Stadium where the San Francisco 49ers are expected to play.Turner-Devcon, the main contractor for the $1.3 billion stadiumin Santa Clara, held safety review classes for the roughly 900 employees working on the job. The company, based in New York and Milpitas, Calif., hopes to prevent another tragedy, like the one that befell Edward Erving Lake Jr., 60, of Vacaville, who was crushed to death about 6:30 a.m. Monday when a pile of rebar fell on his delivery truck.Lake's death - the second Levi's Stadium construction death since June - rattled other workers on the job."I'm worried for my safety," Ross Fuentes told NBC Bay Area, adding that he works on rooftops.MORE: Steel Company Driver Dies at Levi's StadiumSanta Clara police deemed Lake's death accidental, and Cal-OSHA allowed crews back on the job Tuesday, despite an ongoing investigation into just how Lake was killed.A family spokeswoman declined to be interviewed, citing the need for privacy.According to Peter Melton, spokesman for California Department of Industrial...