Jud Burkett | The Spectrum Zoë Keliher, an air safety investigator with the National Transportation Safety Board, explains the process behind her investigation into the crash of the single engine plane in which four people were killed early Saturday as she combs through the wreckage inside a hangar at the St. George Airport Monday, May 28, 2012.

Zoë Keliher, an air safety investigator with the National Transportation Safety Board, on Monday combs through the wreckage inside a hangar at the St. George Airport of a single-engine plane that crashed early Saturday, killing four people. The plane crashed just after takeoff, at about 1:20 a.m. The wreck was found at about 5:30 a.m. during a routine security check, Keliher said.