Whitner was born in Cleveland, Ohio. He is the older brother of former Connecticut Huskiesdefensive endLindsey Witten. He attended Glenville High School in Cleveland. After his senior high school football season he was invited to the U.S. Army All-American Bowl game. He attended Ohio State, not finishing his degree, and then enrolling at San Jose State University. When Whitner was six years old he was hit by an oncoming car after chasing a loose football down the street. He had up to 30 fractures in his legs from the impact and was told that he might not be able to walk again. The oncoming car suffered significant body damage. He spent three months in a full body cast but recovered.
Professional career
Buffalo Bills
The Buffalo Bills selected Whitner in the first round of the 2006 NFL Draft. Whitner was the second safety drafted in 2006 and was selected one pick behind Texas safetyMichael Huff. Whitner missed the beginning of training camp due to a contract holdout. On August 7, 2006, the Buffalo Bills signed Whitner to a five-year, $$29 million contract that includes $13.51 million guaranteed. In his first career game, he recorded his first career interception against Tom Brady. The ruling on the field was a touchdown, but was later overruled when replay showed that Whitner had stepped out of bounds. He finished 2006 with 104 total tackles and one interception for 10 yards. In 2009, Whitner recorded his first career touchdown on a 76-yard interception return from Tampa Bay BuccaneersquarterbackByron Leftwich in Week 2. His most productive game to date was in Week 12 of the 2010 season, where he recorded 18 total tackles against the Pittsburgh Steelers.
On August 4, 2011, Whitner signed with the San Francisco 49ers. After previously announcing on Twitter that he would be going to the Cincinnati Bengals, he changed his mind and signed with San Francisco. He agreed to a three-year, $11.75 million deal with $4 million guaranteed. After his performance in his first year as a 49er, he was named to the USA Today All Joe Team During the 2011 playoffs, Whitner became famous for making vicious hits like against New Orleans Saintsrunning backPierre Thomas as he was driving for a touchdown. The hit forced a fumble recovered by the 49ers and took Thomas out for the rest of the game. At the end of the 2012 season, Whitner and the 49ers appeared in Super Bowl XLVII. In the game, he had eight combined tackles as the 49ers fell to the Baltimore Ravens by a score of 34–31. In 2013, in a game against the St. Louis Rams, Whitner was fined for a hit on receiver Chris Givens. In response to the fine, he indicated that he would be legally changing his last name from "Whitner" to "Hitner", dropping the "W" from his surname. In an appearance on NFL Network's "NFL Total Access" on November 27, 2013, Whitner indicated that his request was to be processed on November 19, but had to be withdrawn when he was unable to honor the judge's requirement that he appear in court. During the same interview, Whitner indicated that he would pursue his name change during the offseason.
Cleveland Browns
Whitner signed a four-year deal worth $28 million with the Cleveland Browns on March 11, 2014. On April 2, 2016, Whitner was released by the team. With his release, the Cleveland Browns cleared $3.95 million of cap space.
Washington Redskins
On October 5, 2016, Whitner signed with the Washington Redskins. After two games with the team, he became the starter at strong safety. He was placed on injured reserve on December 28 due to a quad injury.
