Jonathan Martin, seen here during an NFL rookies' camp in 2012, allegedly received threatening texts and voice mails from teammate Richie Incognito that included racial slurs. Joel Auerbach/Getty Images hide caption

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Former Pittsburgh Steelers defensive lineman L.C. Greenwood waving to fans in 2006. He died Sunday at the age of 67. Stephen M. Gross /UPI /Landov hide caption

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Junior Seau sustained many concussions during his career and was suffering from a degenerative brain disease when he killed himself in May 2012. Otto Greule Jr./Getty Images hide caption

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Atlanta Falcons linebacker Brian Banks made his NFL debut in a preseason game Thursday night, more than 10 years after he was sent to prison for a crime of which he was later exonerated. John Bazemore/AP hide caption

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Former New England Patriots tight end Aaron Hernandez will be held without bail on murder charges, a judge has confirmed. Here, Hernandez, left, stands with one his defense attorneys, Michael Fee, during his arraignment in Attleboro District Court Wednesday. Mike George/AP hide caption

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Washington Redskins quarterback Robert Griffin III already promotes Subway sandwiches. Will health insurance be next? Carolyn Kaster/AP hide caption

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New England Patriots quarterback Tim Tebow throws during practice in Foxborough, Mass., on Tuesday. Charles Krupa/AP hide caption

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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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He'll have to find a new team now: Then-New York Jets backup quarterback Tim Tebow on the sidelines during a game last December. The team cut him from its roster on Monday. John Angelillo /UPI /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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A Washington Redskins flag is waved prior to the NFC Wild Card Playoff Game against the Seattle Seahawks at FedExField in January. Al Bello/Getty Images hide caption

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