Tight end best known as The Ghost, he played in the NFL from 1974-1984, most famously for the Oakland Raiders.
He played college football at Notre Dame, where he won a National Championship and was an All-American in 1973.
He was a five-time Pro Bowl and five-time All-Pro first team selection.
He was born in Bemidji, Minnesota.
He won two Super Bowls with the Raiders, including one with coach John Madden.