Longtime Chiefs executive Jack Steadman, the architect of the only Super Bowl-winning team in franchise history, has died. He was 86.

The team says Steadman died early Sunday of natural causes. Steadman had been dealing with Alzheimer’s disease in recent years.

A longtime friend of Chiefs founder Lamar Hunt, Steadman helped establish the American Football League and the Dallas Texans, the franchise that would ultimately move to Kansas City.

He became general manager in 1966, building the team that beat the Minnesota Vikings in the Super Bowl four years later. He became president of the Chiefs in 1976 and remained active on its board of directors until his retirement at the end of the 2006 season.

Funeral arrangements have not been disclosed.