He was 85.
Butler had the infection since November, which stemmed from a knee replacement that was needed because of a leg injury that ended his career in 1959.
Butler, a Steelers great in the 1950s, was inducted into the Pro Football Hall of Fame in 2012.
He was part of the NFL's All-Decade Team of the 1950s. When he retired, he was second on the league's all-time list with 52 interceptions.
After his playing days, Butler was a long-time scout.
"Jack Butler was one of the all-time great Steelers," Steelers president Art Rooney II said in a statement.
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Former New York Jets wide receiver George Sauer has died of Alzheimer's disease in Westerville, Ohio, according to the New York Daily News. He was 69.
Sauer helped the Jets win Super Bowl III over the Baltimore Colts with eight catches for 133 yards, even though the Jets were heavy underdogs.
Sauer starred collegiately at Texas and played six seasons with the Jets. He had at least 1,000 yards receiving three times. He led the American Football League with 75 receptions in the 1967-68 season.
After retiring from the NFL at age 27, he spent the 1974 season with the New York Stars and Charlotte Hornets of the World Football League.
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Amy Trask, long-time chief executive officer of the Oakland Raiders who had a strong commitment to former owner Al Davis, but not necessarily his son and heir, Mark, announced on Saturday she has resigned.
"Earlier today, I informed Mark Davis of my decision to leave the Raiders," Trask said in an email to reporters "Having honored a commitment that I made to effectuate a smooth transition and transfer of control, I no longer wish to remain with the organization."
For years, Trask was the highest-ranking female executive in sports, not counting ownership.
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San Francisco 49ers rookie running back Marcus Lattimore told the Sacramento Bee that he would be OK with sitting out the 2013 season.
The former South Carolina star is still recovering from surgery after tearing three knee ligaments during a game early last season.
After drafting Lattimore in the fourth round of last month's draft, 49ers coach Jim Harbaugh has considered sitting him out.
"That would be fine," Lattimore said. "Whatever happens, you know, these next three months will probably determine that. I'm just going to continue to keep working hard, and if I'm called upon, I feel like hopefully I'll be ready."
Harbaugh said Lattimore has progressed well so far.
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Chicago Bears coach Marc Trestman is using a helmet camera to help evaluate quarterbacks at the team's rookie minicamp.
The Chicago Tribune reported that a small camera was attached to the left side of quarterback Matt Blanchard's helmet on Friday during the Bears' first day of practice. The idea is to give coaches the same view the quarterback has when a play is developing and use that information to assess him.
Blanchard, who is a second-year player, is competing for the third quarterback spot behind starter Jay Cutler and backup Josh McCown.
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The San Diego Chargers have signed fifth round draft pick Steve Williams, a cornerback.
Five of San Diego's six draft choices are signed, including second round inside linebacker Manti Te'o, third round wide receiver Keenan Allen, sixth round outside linebacker Tourek Williams, seventh round quarterback Brad Sorensen and Williams.
The only unsigned draft pick is first round offensive tackle D.J. Fluker.
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Cobi Hamilton became the Cincinnati Bengals' third draft pick to sign a contract. The wide receiver out of Arkansas was a sixth-round pick after setting school season records in 2012 for receptions (90) and receiving yards (1335).
The Bengals previously signed seventh-round picks offensive tackle Reid Fragel of Ohio State and center T.J. Johnson of South Carolina.