Stephanie Cosme, 32, was killed last year when she inadvertently walked into the rotating propeller of an aircraft in California

A US air force civilian contractor had become disoriented recording data at an airport in California last year when she walked into a jet’s rotating propeller and was killed, officials said on Friday.

In a statement outlining the findings of a report into the contractor’s death, the air force materiel command said that 32-year-old Stephanie Cosme was mortally injured on 7 September when she inadvertently walked into the rotating propeller of an MQ-9A that was parked at Gray Butte airfield.