Weather On Demand
Prosecutors said during a brief court hearing that Lamparello was "planning to burn down St. Patrick's Cathedral" when he was arrested last week.
Michael Center, 55, is the third coach to plead guilty in the nationwide scandal that has also ensnared wealthy parents.
Tuesday's death is the second fatal fall inside the park this year, and the third in the Grand Canyon area.
Kelly, who has faced similar allegations for decades, has pleaded not guilty to the charges and denied any wrongdoing.
Police are recommending the driver be charged with eight counts of attempted murder.