John Mackey, Pro Football Hall of Famer, has passed away at the age of 69.
Mackey, former president of the NFL Players Association, played 10 seasons in the NFL for the Baltimore Colts and San Diego Chargers.
He caught 331 passes for 5,236 yards and 38 touchdowns, becoming the second tight end ever to be inducted into the Hall of Fame.
DeMaurice Smith, current executive director of NFLPA, honored Mackey on his Twitter page.
"John Mackey is still a leader. As President of the NFLPA he led the fight for fairness with brilliance and ferocious drive," Smith wrote. "John Mackey has inspired me and will continue to inspire our players and define our institution. He will be missed but never forgotten."