Quote:
An autopsy summary by the Clear Creek County coroner estimated that 18-year-old Sol Pais likely died on April 15 — the day authorities said she flew to Denver from Miami. The FBI's Denver office said it learned of Pais' travel the following morning. Agents also learned the day after she died that Pais had gone directly to a gun store from the airport and purchased a shotgun and ammunition.
Pais was already dead of a self-inflicted gunshot wound by the time agents began retracing her steps, according to the coroner's initial autopsy findings.
[snip]
Columbine and other schools tightened security the afternoon of April 16 and closed entirely on April 17 when authorities still had not located Pais. She never threatened a specific school, authorities said.