John Barnett had worked for Boeing for 32 years, until his retirement 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.
I mean, isn’t that how lefty commies defeated the Nazi’s? Never said it was easy, but they got there in the end, and there’s still more work to be done it would seem. We got numbers on our side, $32.6trillion worth of them wouldn’t even fill up a single 737 airplane.