Franco Harris -- a Pro Football Hall of Famer and one of the most legendary Pittsburgh Steelers of all-time -- has died ... his family announced Wednesday.
He was 72 years old.
A cause of death has yet to be revealed ... though the Harris family said he passed away overnight.
"The entire team at the Pro Football Hall of Fame is immensely saddened today," Hall of Fame president Jim Porter said Wednesday morning in a statement.
"We have lost an incredible football player, an incredible ambassador to the Hall and, most importantly, we have lost one of the finest gentlemen anyone will ever meet.