Gregg Popovich's wife, Erin Popovich, passed away on Wednesday.

The Popovichs were married for four decades.

"We mourn the loss of Erin," said RC Buford. "She was a strong, wonderful, kind, intelligent woman who provided love, support and humor to all of us." 

According to Adrian Wojnarowski, Erin Popovich had been battling a lengthy illness.