A hospital worker shot and killed two employees and then killed himself at a medical center Thursday, sending panicked people fleeing, police and witnesses said. The gunman was identified as Mario Ramirez, 50, who died of an apparent self-inflicted gunshot wound, police said. The victims were Hugo Bustamante, 46, who died at the scene, and Kelly Hales, 56, who was taken to the hospital's emergency room in critical condition and died several hours later. Police Chief Anthony Batts said the gunfire erupted just before noon at Long Beach Memorial Medical Center. He said the motive remained under investigation but noted the violence came amid a flurry of recent shootings in the country.