A former Boeing employee known for raising concerns about the firm's production standards has been found dead in the US.
John Barnett worked for Boeing for more than 30 years before retiring in 2017.
In the days before his death, he had been giving evidence in a whistleblower lawsuit against the company.
Boeing said it was saddened to hear of Mr Barnett's passing. The Charleston County coroner confirmed his death to the BBC on Monday.
It said the 62-year-old had died from a "self-inflicted" wound on 9 March and police were investigating.
Mr Barnett had worked for the US plane giant for three decades, until his retirement in 2017 on health grounds.
From 2010, he was employed as a quality manager at the North Charleston plant. The facility builds the 787 Dreamliner, a state-of-the-art airliner used mainly on long-haul routes.
In 2019, Mr Barnett told the BBC that under-pressure workers had been deliberately fitting sub-standard parts to aircraft on the production line.
He also said he had uncovered serious problems with oxygen systems, which could mean one in four breathing masks would not work in an emergency.
He said soon after starting work in South Carolina he had become concerned that the push to get new aircraft built meant the assembly process was rushed and safety was compromised, something the company denied.
He later told the BBC that workers had failed to follow procedures intended to track components through the factory, allowing defective components to go missing.
He said in some cases, sub-standard parts had even been removed from scrap bins and fitted to planes that were being built to prevent delays on the production line.
He also claimed that tests on emergency oxygen systems due to be fitted to the 787 showed a failure rate of 25%, meaning that one in four could fail to deploy in a real-life emergency.
Mr Barnett said he had alerted managers to his concerns, but no action had been taken.
Boeing denied his assertions. However, a 2017 review by the US regulator, the Federal Aviation Administration (FAA), did uphold some of Mr Barnett's concerns.
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