Steve McMichael, a Hall of Fame defensive tackle for the Chicago Bears with a theatrical personality and a ferocious intensity who helped anchor what might have been the most predatory defense in the history of the N.F.L. during the team’s 1985 Super Bowl-winning season, died on Wednesday in Joliet, Ill. He was 67.

The Bears confirmed his death, in hospice care. The team said he had struggled for years with amyotrophic lateral sclerosis, the degenerative disease of the nervous system more commonly known as A.L.S. or Lou Gehrig’s disease.

McMichael played 15 years in the N.F.L., 13 of them with Chicago and none more rapacious than the 1985 season. The Bears lost only once that season while rampaging through the league with the so-called 46 defense, orchestrated by the team’s boisterous defensive coordinator, Buddy Ryan.

McMichael during the National Football Conference championship game against the Los Angeles Rams at Soldier Field in Chicago on Jan. 12, 1986. The Bears won and went on to victory in Super Bowl XX. Credit…Jonathan Daniel/Getty Images

Placing eight defensive players near the line of scrimmage, Chicago hounded, outmuscled and intimidated opponents. No victory was more thorough than the Bears’ 44-0 dismantling of the Dallas Cowboys on their own field on Nov. 17, 1985. It was the worst defeat in the team’s then-26-year history.

That afternoon, McMichael collected one of the 92 ½ career sacks he accumulated with the Bears, placing him second in franchise history to his teammate Richard Dent. In the view of many, Dallas simply gave up. Tom Landry, Dallas’s coach at the time, called the defeat “an old-fashioned country licking.”