The sky is falling — at least on Boeing.

A second whistleblower has died under mysterious circumstances, just two months after another one allegedly shot himself in the head — and the attorneys for both men hope their deaths don’t scare away the at least 10 other whistleblowers who want the company to clean up its act.

Joshua Dean, 45, a former quality auditor at Spirit AeroSystems which assembles fuselage sections for Boeing, died Tuesday morning from a fast-growing mystery infection.

Dean’s death comes less than…