NFL - Peterson banned over tree branch attack

(FILES) In this November 4, 2014 file photo, NFL running back Adrian Peterson of the Minnesota Vikings addresses the media after pleading "no contest" to a lesser misdemeanor charge of reckless assault in Conroe, Texas. AFP PHOTO / FILES /Bob Levey/Getty Images (AFP Photo/Bob Levey)

- Minnesota Vikings running back Adrian Peterson was banned for the rest of the 2014 season as NFL chiefs accused the star of showing no remorse for beating his four-year-old son with a tree branch.

National Football League commissioner Roger Goodell said the league will not consider reinstating Peterson before April 15 and ordered him to undergo counseling, therapy and treatment.

"You have shown no meaningful remorse for your conduct," Goodell said in an open letter to Peterson.

The league players' union said it will appeal and hope to have the case heard by an independent arbitrator. Peterson has already been fined and ordered to perform community service over the incident.