A tragic accident at a West Babylon recycling plant left one man dead and his son consumed with guilt Friday.Police say 58-year-old Miquel Marquez and his son Luis were working together at Omni Recycling around 1:30 a.m. Friday. Luis, 25, was driving a large and noisy pay loader back and forth between buildings. Police say before Luis heard the screams of his coworkers, he saw his father lying motionless on the ground. Coworkers say it was only then that the young man realized he had run over and killed his father.The Occupational Safety and Health Administration is investigating the accident. Meanwhile, Omni Recycling and its employees are mourning the tragic loss.