A former Boeing employee, John Barnett, who had voiced concerns about the company’s production practices, was found dead, as reported by the BBC on Monday.

Barnett, who had a 32-year tenure with Boeing until his 2017 retirement, died from a self-inflicted wound on Mar. 9, confirmed by the Charleston County coroner. Barnett had been actively participating in a whistleblower lawsuit against Boeing at the time of his death.