By Gregg Rosenthal | Around The NFL Editor | Published: July 28, 2015
http://www.nfl.com/news/story/0ap3000000504258/article/roger-goodell-upholds-tom-brady-suspension
The full final decision from Goodell can be read here, although it doesn't necessarily end this saga. NFL Media Insider Ian Rapoport reported Tuesday that Brady will sue. They will seek an injunction on this suspension to try to keep Brady on the field.
Goodell indicated that Brady's destruction of evidence was a factor in upholding the suspension.
"The most significant new information that emerged in connection with the appeal was evidence that on or about March 6, 2015 -- the very day that was interviewed by Mr. Wells and his investigated team -- Mr. Brady instructed his assistant to destroy the cellphone that he had been using since early 2014, a period that included that AFC Championship game and the initial weeks of the subsequent information," Goodell wrote in the final decision on the appeal.

http://www.nydailynews.com/sports/football/goodell-uphold-tom-brady-4-game-ban-report-article-1.2306506
Citing information that Tom Brady destroyed possible evidence in the NFL’s long investigation into Deflategate, Commissioner Roger Goodell Tuesday upheld the four-game suspension imposed on Patriots quarterback for his role in the deflating of footballs used in the AFC Championship Game in January.
Goodell released the opinion Tuesday afternoon informing Brady that his appeal had been denied, emphasizing new information disclosed by Brady and his representatives in connection with the hearing.
Brady and the NFL Players Association are expected to file an injunction that would stay the suspension as the case heads to federal court. If the junction is granted, Brady would likely play the first game of the season.