Joshua Dean, a former quality auditor at Boeing supplier Spirit AeroSystems and one of the first whistleblowers to allege Spirit leadership had ignored manufacturing defects on the 737 MAX, died Tuesday morning after a struggle with a sudden, fast-spreading infection.

Known as Josh, Dean lived in Wichita, Kan., where Spirit is based. He was 45, had been in good health and was noted for having a healthy lifestyle.

He died after two weeks in critical condition, his aunt Carol Parsons said.