A former Boeing employee, John Barnett, who had been a whistleblower about the company's production standards, was found dead with a self-inflicted wound. He had been giving evidence in a lawsuit against Boeing and had previously raised concerns about the company's practices, including the use of sub-standard parts and problems with oxygen systems. Boeing had denied his assertions, but a 2017 review by the US regulator upheld some of his concerns. Barnett's death is currently under investigation.