Baylor quarterback Robert Griffin III (10) runs for a touchdown during the second half of an NCAA college football game against Kansas in Lawrence, Kan., Saturday, Nov. 12, 2011. Baylor defeated Kansas 31-30 in overtime.

Baylor quarterback Robert Griffin III (10) attempts to escape a tackle by Texas cornerback A.J. White (2) in the first half of an NCAA college football game Saturday, Dec. 3, 2011, in Waco, Texas.

Robert Griffin III, of Baylor University, holds the Heisman Trophy award after being named the winner, Saturday, Dec. 10, 2011, in New York.

Baylor quarterback Robert Griffin III, left, is joined by his father Robert Griffin Jr. as he displays his sock and new jersey while speaking to reporters after he was selected as the second pick overall by the Washington Redskins in the first round of the NFL football draft at Radio City Music Hall, Thursday, April 26, 2012, in New York.

Washington Redskins quarterback Robert Griffin III is knocked out of boards shy of the goal line during the second half of an NFL football game against Cincinnati Bengals in Landover, Md., Sunday, Sept. 23, 2012.

Washington Redskins quarterback Robert Griffin III (10) leaps for the goal line attempting to score a touchdown against New York Giants defensive end Jason Pierre-Paul (90) during the second quarter of an NFL football game, Sunday, Dec. 14, 2014, in East Rutherford, N.J.

Washington Redskins quarterback Robert Griffin III celebrates a touchdown during the first half of an NFL football game against the Dallas Cowboys on Sunday, Dec. 30, 2012, in Landover, Md.

Washington Redskins rookie quarterback Robert Griffin III (10) runs for a gain during an NFL football game against the Cincinnati Bengals at FedEx Field on Sunday September 23, 2012 in Landover, Maryland. Cincinnati won 38-31.

Washington Redskins quarterback Robert Griffin III (10) celebrates his touchdown with tight end Logan Paulsen (82) during the second half of an NFL football game against the Dallas Cowboys Sunday, Dec. 30, 2012, in Landover, Md.

Washington Redskins quarterback Robert Griffin III hugs Philadelphia Eagles quarterback Michael Vick, left, after a NFL football game in Landover, Md., Monday Sept. 9, 2013. The Eagles defeated the Redskins 33-27.

Washington Redskins quarterback Robert Griffin III (10) runs for a touchdown past St. Louis Rams strong safety Craig Dahl during the first quarter of an NFL football game, Sunday, Sept. 16, 2012, in St. Louis.

Washington Redskins fullback Darrel Young celebrates his touchdown with quarterback Robert Griffin III, right, during the second half of a NFL football game against San Diego Chargers in Landover, Md., Sunday, Nov. 3, 2013.

Washington Redskins quarterback Robert Griffin III (10) celebrates with fans after a 76-yard touchdown run during the second half of an NFL football game against the Minnesota Vikings, Sunday, Oct. 14, 2012, in Landover, Md.

Washington Redskins quarterback Robert Griffin III dives for a first down during the first half of an NFL preseason football game against the Indianapolis Colts on Saturday, Aug. 25, 2012, in Landover, Md.

Washington Redskins quarterback Robert Griffin III (10) reacts to fullback Darrel Young's touchdown during the second half of an NFL football game against the Philadelphia Eagles in Landover, Md., Saturday, Dec. 20, 2014.

Cleveland Browns quarterback Robert Griffin III (10) celebrates his touchdown run in the third quarter of an NFL football game against the Cincinnati Bengals, Sunday, Dec. 11, 2016, in Cleveland. The Bengals won 23-10.

Cleveland Browns quarterback Robert Griffin III, center, avoids a tackle by Buffalo Bills free safety Corey Graham, right, and outside linebacker Jerry Hughes before scoring a touchdown run during the second half of an NFL football game, Sunday, Dec. 18, 2016, in Orchard Park, N.Y.