Tim Tebow (right) shakes hands with New England Patriots quarterback Tom Brady after the Patriots defeated the Broncos on Dec. 18, 2011. Now, they're due to be teammates. Mark Leffingwell /Reuters /Landov hide caption

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Eric Fisher, offensive tackle from Central Michigan, was the No. 1 pick in the 2013 NFL draft. He was chosen by the Kansas City Chiefs. Rich Kane /UPI /Landov hide caption

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Oklahoma quarterback Steve Davis, left, and coach Barry Switzer celebrate the team's No. 1 ranking after the Orange Bowl in 1976. Davis, 60, died Sunday in the crash of a small plane. Switzer called Davis a "great role model for young people." /AP hide caption

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The brain of former NFL star Junior Seau, who committed suicide last year, showed signs of the kind of neurodegenerative disease associated with repetitive head trauma. Elsa/Getty Images hide caption

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Linebacker Ray Lewis announced Wednesday that he will retire after the Baltimore Ravens' season ends. Most media coverage of Lewis' legacy has omitted his part in a 2000 double-homicide case. Harry How/Getty Images hide caption

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Andy Reid as he left the field Sunday in New Jersey. His last game as head coach of the Philadelphia Eagles was a 42-7 loss to the New York Giants. Elsa/Getty Images hide caption

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Dr. Ann McKee, professor of neurology and pathology of Boston University School of Medicine and co-director of the Veterans Affairs Center for the Study of Traumatic Encephalopathy, inspects a brain in the Bedford Veteran Medical Center last year. Stan Grossfeld/Boston Globe via Getty Images hide caption

itoggle caption Stan Grossfeld/Boston Globe via Getty Images

Denver Broncos Coach John Fox yells at field judge Jimmy Buchanan during the Broncos' game against Atlanta Monday. Referring to the game, the NFL insisted that players and coaches give replacement referees, and the game, more respect. Kevin C. Cox/Getty Images hide caption

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LSU cornerback Tyrann Mathieu (right) earned the nickname "Honey Badger" for hits like this one, against Arkansas quarterback Tyler Wilson on Nov. 25, 2011. Mathieu is one of five finalists named Monday for the Heisman Trophy. Gerald Herbert/AP hide caption

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Hank Williams Jr., here seen promoting Monday Night Football, will not be part of tonight's broadcast after he made comments comparing President Obama to Hitler.

John Raoux/AP hide caption

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