Richardson, who missed a walkthrough before the AFC title game, received a two-game suspension from the team, general manager Ryan Grigson confirmed. If Indy chooses to keep Richardson, he'd serve the second game of the suspension next season.
ESPN.com expects the Colts to exercise their option to void Richardson's contract, and the players' union to challenge that move.
Richardson said last week he was not at the walkthrough practice Saturday before Sunday's AFC title game due to a family emergency.
"I had to miss walk-through," Richardson said, per ESPN. "I'm dealing with a very serious family emergency. I'm still at the hospital. I wouldn't purposely just miss walk-through. I wouldn't just purposely turn my back on the team."
According to WTHR's Bob Kravitz earlier this week, Richardson "didn't call" team officials to let them know he'd be absent Saturday.
Richardson, who was the No. 3 pick in the 2012 draft, has been a disappointment offensively since being acquired in a 2013 trade with the Browns. He has totaled just 977 rushing yards and averaged 3.1 yards per carry in 29 games with Indianapolis.
NFL reporter Howard Balzer says the Colts suspended Richardson for the game. Regardless, it was the second straight game in which he was inactive.
Richardson is signed for 2015 at nearly $3.2 million, but his future with the team seems tenuous.
It is the second straight week Richardson will be inactive.
The Colts are currently 7-point underdogs against the Patriots Sunday.
"I had to miss walk-through," Richardson said. "I'm dealing with a very serious family emergency. I'm still at the hospital. I wouldn't purposely just miss walk-through."
Richardson said he would have been at Saturday’s walk-through had the family emergency not popped up.
"I wouldn't just purposely turn my back on the team," he said.
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