The 43-year-old Seau committed suicide Wednesday at his home in suburban Oceanside, Calif. He played parts of 20 seasons in the NFL, including 13 with the Chargers.
At least two groups of researchers have been studying athletes' brains for signs of chronic traumatic encephalopathy.
RGIII is the Redskins' starter
Robert Griffin III already has the No. 1 quarterback job with the Washington Redskins.
Coach Mike Shanahan said the Heisman Trophy winner from Baylor will work with the starters when the Redskins begin full offseason practices later this month.
Said Shanahan: "He's the starter. Period."
Griffin completed a three-day rookie camp Sunday, a little over a week after he was selected second overall by the Redskins in the NFL draft. Griffin wore a No. 10 jersey with "Griffin III" on the back - plus gold shoes with burgundy laces.
Pittsburgh Steelers quarterback Ben Roethlisberger has graduated from Miami University in southwest Ohio, about nine years after leaving school for the NFL.
The 30-year-old Roethlisberger received his bachelor's degree in education and joined nearly 600 students during commencement.
The New York Jets signed safety Josh Bush, one of their sixth-round draft picks, to a four-year contract. The Jets also signed quarterback Matt Simms, the youngest son of Phil Simms, and offensive lineman Frederick Koloto as undrafted free agents. . . . The Pittsburgh Steelers signed fourth-round draft pick Alameda Ta'amu and fifth-round pick Chris Rainey.