The NFL has said it did not intentionally seek to mislead players and has taken action to better protect players and to advance the science of concussion management and treatment.
Karras played his entire NFL career with the Lions before retiring in 1970 at age 35. He was a first-team All-Pro in 1960, 1961 and 1965, and he made the Pro Bowl four times. He missed the 1963 season when he was suspended by NFL Commissioner Pete Rozelle in a gambling probe. Karras was recognized by the Pro Football Hall of Fame as a defensive tackle on the All-Decade Team of the 1960s.
"We know Alex first and foremost as one of the cornerstones to our Fearsome Foursome defensive line of the 1960s and also as one of the greatest defensive linemen to ever play in the NFL," Lewand said. "Many others across the country came to know Alex as an accomplished actor and as an announcer during the early years of 'Monday Night Football.'
"We join his legions of fans from both sports and entertainment in prayer and support for Alex, his wife Susan, and his entire family during this most difficult time."