A second whistleblower to raise concerns about the safety of Boeing aircraft has died. Joshua Dean, 45, was a former quality auditor for Boeing supplier Spirit AeroSystems, and his death comes two months after Boeing whistleblower John Barrett was found dead of an apparent suicide a day after testifying against the planemaker. Dean's attorneys, Brian Knowles and Rob Turkewitz, are calling Dean's death a “loss to the aviation community.”