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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.

Spirit spokesperson Joe Buccino said: “Our thoughts are with Josh Dean’s family. This sudden loss is stunning news here and for his loved ones.”

Dean had given a deposition in a Spirit shareholder lawsuit and also filed a complaint with the Federal Aviation Administration alleging “serious and gross misconduct by senior quality management of the 737 production line” at Spirit.

Spirit fired Dean in April 2023, and he had filed a complaint with the Department of Labor alleging his termination was in retaliation for raising concerns related to aviation safety.

Parsons said Dean became ill and went to the hospital because he was having trouble breathing just over two weeks ago. He was intubated and developed pneumonia and then a serious bacterial infection, MRSA.

His condition deteriorated rapidly, and he was airlifted from Wichita to a hospital in Oklahoma City, Parsons said. There he was put on an ECMO machine, which circulates and oxygenates a patient’s blood outside the body, taking over heart and lung function when a patient’s organs don’t work on their own.

His mother posted a message Friday on Facebook relating all those details and saying that Dean was “fighting for his life.”