Tony Tomsic/Associated Press
Bob Kuechenberg, a six-time Pro Bowl guard in the National Football League, two-time Super Bowl champion and member of the only N.F.L. team to achieve a perfect season, the 1972 Miami Dolphins, died on Saturday at his home in Fort Lauderdale, Fla. He was 71.
His former wife, Marilyn Nix Kuechenberg, said the cause was a heart attack.
Kuechenberg joined the Dolphins as a free agent in 1970, the future Hall of Fame coach Don Shula’s first season, and played for them until 1983. He was part of a daunting offensive line that included guard Larry Little and center Jim Langer, both enshrined in the Hall of Fame.