"Dennis passed away last night from complications of cardiac arrest," Green's family said in a statement. "His family was by his side and he fought hard."
Saddened to learn the news about #DennyGreen. He added so much to our great teams under Bill Walsh. My condolences to his family
— Jed York (@JedYork) July 22, 2016
Green, who also served and a 49ers analyst for CSN Bay Area, had a career record of 113-94 as a head coach and went 4-8 in the playoffs.