Workers replacing a storm drain at an Ohio job site warned that a trench had become dangerously deep, but federal investigators say they were told to enter it anyway — minutes before it collapsed, killing one worker and severely injuring two others.

Jose Alberto Barajas Martinez, 28, was killed in the Dec. 5 collapse near Milford. OSHA later found the roughly 8-foot-deep trench had no protection against a cave-in, despite federal rules requiring safeguards for trenches deeper than 5 feet, according to records obtained by the Cincinnati Enquirer.

Whispering Creek LLC, the landscaping company on the job, was cited for five safety violations and…

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