Dan Reeves, who spent decades in the NFL as a running back and a coach, has died "due to complications from a long illness," according to his family. He was 77.

"Legendary NFL player and coach Dan Reeves passed away early this morning, peacefully and surrounded by his loving family at his home in Atlanta, GA," the family said in a statement.

"His legacy will continue through his many friends, players and fans as well as the rest of the NFL community," they added.

Falcons owner and chairman Arthur M. Blank fondly remembered Reeves' impact on Atlanta, where he coached from 1997 to 2003.

"Dan Reeves leaves a lasting legacy in our game as a player and coach. His track record of success in Dallas, Denver, New York and Atlanta over several decades speaks for itself, marking a long and successful life and career in football," said Blank, 79.

"On behalf of the Atlanta Falcons, I extend our condolences to Dan's family and friends as they mourn his passing," he added.

Prior to his coaching career, Reeves played eight seasons as a running back for the Dallas Cowboys.

Currently, Reeves is the only person in NFL history to play and coach in multiple Super Bowls. He won two Super Bowl titles with the Cowboys: once as a player in 1972 and another as an assistant coach in 1978.