According to Bob Kravitz of WTHR, Richardson did not travel because he missed Saturday's walk-through and did not notify the Colts in advance. Richardson was also reportedly not going to dress for Sunday's game.
Richardson began the season as the starter but has averaged just 3.3 yards per carry over 15 games and saw his role diminish later in the regular season, with Boom Herron seeing an increased workload.
"That situation will never happen to me again," he said, according to the Indianapolis Star. "Anybody can quote me, today, because it's never going to happen again."
The Colts first acquired Richardson, the No. 3 overall pick in the 2012 draft out of Alabama, in a September 2013 trade in which they sent a first-round pick to the Cleveland Browns. Over 14 games with the Colts last season, Richardson averaged only 32.7 yards per game.