The University of Michigan is mourning the loss of athletics administrator Greg Harden, Tom Brady's life coach in Ann Arbor ... who died after complications from surgery.
The school shared the tragic news minutes ago ... days after it announced Harden remained in the hospital after undergoing a procedure on Monday.
Harden was known as the program's "secret weapon" due to his role as a mental coach for standout Wolverine athletes for decades ... including Brady, Desmond Howard, Jalen Rose and Michael Phelps.