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’m saying if the newer, problematic planes aren’t going to be forced to ground by regulators, pilots should refuse to fly them. Surely there are plenty of planes still flying built by Boeing before they sold souls. Surely those won’t require massive retraining. Fly them instead.
If I learned anything in my time on this planet is that there are far too few people in the world willing to stand up for their principles :(