turns deadly. at six flags in texas on friday, 52-year-old rosy esparza slipped out of her seat on a 14-story high roller coaster. it was actually in motion at the time. she fell and she died. the park is refusing to speculate on exactly what happened, pending an ongoing investigation, which wee told you is going to be done by the park itself because there isn't any regulation. some are saying esparza's weight may have played a role. i want to go to ed lavandera tonight with an outfront investigation. >> reporter: it's supposed to be the first thrilling moment of the texas giant. climb the peak and race down, what six flags hails as the steepest drop of any wooden roller coaster in the world. this is where rosy esparza tumbled to her death. the medical examiner says esparza was sitting in the third row and fell 75 feet. her body struck a metal support beam and then landed on the metal roof of a tunnel. a terrifying sight for carmen brown, who saw it firsthand.