Photos: Colin Kaepernick through the years
SAN FRANCISCO, CA - CIRCA 2011: In this handout image provided by the NFL, Colin Kaepernick of the San Francisco 49ers poses for his NFL headshot circa 2011 in San Francisco, California. (Photo by NFL via Getty Images)
NEW ORLEANS, LA - AUGUST 12: Colin Kaepernick # 7 of the San Francisco 49ers defends as his team plays the New Orleans Saints during their pre season game at Louisiana Superdome on August 12, 2011 in New Orleans, Louisiana. (Photo by Sean Gardner/Getty Images)
EAST RUTHERFORD, NJ - SEPTEMBER 30: Colin Kaepernick #7 celebrates a touchdown with Alex Boone #75 and Joe Staley #74 of the San Francisco 49ers during a game against the New York Jets at MetLife Stadium on September 30, 2012 in East Rutherford, New Jersey. (Photo by Jeff Zelevansky/Getty Images)
FOXBORO, MA - DECEMBER 16: Colin Kaepernick #7 of the San Francisco 49ers warms up before a game with the New England Patriots at Gillette Stadium on December 16, 2012 in Foxboro, Massachusetts. (Photo by Jim Rogash/Getty Images)
SAN FRANCISCO, CA - JANUARY 12: Quarterback Colin Kaepernick #7 of the San Francisco 49ers looks on during warm ups prior to the NFC Divisional Playoff Game against the Green Bay Packers at Candlestick Park on January 12, 2013 in San Francisco, California. (Photo by Harry How/Getty Images)
GLENDALE, AZ - DECEMBER 29: Colin Kaepernick #7 of the San Francisco 49ers smiles on the sideline against the Arizona Cardinals during a game at University of Phoenix Stadium on December 29, 2013 in Glendale, Arizona. (Photo by Christian Petersen/Getty Images)
NEW YORK, NY - JANUARY 31: Colin Kaepernick attends Beats By Dr. Dre special event At Marquee New York on January 31, 2014 in New York City. (Photo by Noam Galai/Getty Images for Beats by Dr. Dre)
LOS ANGELES, CA - JULY 16: (L-R) Model Chrissy Teigen and NFL quarterback Colin Kaepernick backstage at The 2014 ESPYS at Nokia Theatre L.A. Live on July 16, 2014 in Los Angeles, California. (Photo by Christopher Polk/Getty Images For ESPYS)
LOS ANGELES, CA - JUNE 26: Football player Colin Kaepernick with the San Francisco 49ers is seen on set for 'This is the Cap' Fall campaign shoot on June 26, 2015 in Los Angeles, California. (Photo by John Sciulli/Getty Images for New Era)
SANTA CLARA, CA - OCTOBER 04: Colin Kaepernick #7 of the San Francisco 49ers talks with Aaron Rodgers #12 of the Green Bay Packers after their game at Levi's Stadium on October 4, 2015 in Santa Clara, California. (Photo by Ezra Shaw/Getty Images)
SAN DIEGO, CA - SEPTEMBER 01: Colin Kaepernick #7 of the San Francisco 49ers signs autographs for fans after a 31-21 win over the San Diego Chargers during a preseason game at Qualcomm Stadium on September 1, 2016 in San Diego, California. (Photo by Harry How/Getty Images)
ATLANTA, GA - DECEMBER 18: Colin Kaepernick #7 of the San Francisco 49ers and Eli Harold #58 kneel during the National Anthem prior to the game against the Atlanta Falcons at the Georgia Dome on December 18, 2016 in Atlanta, Georgia. (Photo by Kevin C. Cox/Getty Images)
NEW YORK, NY - APRIL 25: Colin Kaepernick (L) and Nessa attend the 2017 Time 100 Gala at Jazz at Lincoln Center on April 25, 2017 in New York City. (Photo by Dimitrios Kambouris/Getty Images for TIME)
NEW YORK, NY - DECEMBER 05: Colin Kaepernick receives the SI Muhammad Ali Legacy Award during SPORTS ILLUSTRATED 2017 Sportsperson of the Year Show on December 5, 2017 at Barclays Center in New York City. Tune in to NBCSN on December 8 at 8 p.m. ET or Univision Deportes Network on December 9 at 8 p.m. ET to watch the one hour SPORTS ILLUSTRATED Sportsperson of the Year special. (Photo by Slaven Vlasic/Getty Images for Sports Illustrated)
LOS ANGELES, CA - MAY 03: (L-R) Rick Kaepernick, Teresa Kaepernick, Colin Kaepernick and Nessa attend the VH1's 3rd Annual 'Dear Mama: A Love Letter To Moms' - Cocktail Reception at The Theatre at Ace Hotel on May 3, 2018 in Los Angeles, California. (Photo by Leon Bennett/Getty Images)
NEW YORK, NY - MARCH 07: Colin Kaepernick attends as O, The Oprah Magazine hosts special NYC screening of 'A Wrinkle In Time' at Walter Reade Theater at Walter Reade Theater on March 7, 2018 in New York City. (Photo by Mike Coppola/Getty Images)