Von Miller will be suspended for the first four games of the 2013 season due to a violation of the league's drug policy.

Miller was the 2012 Defensive Rookie of the Year and is widely considered the best player on the Denver Broncos' defense.

Miller had 18.5 sacks last season.

Benjamin Allbright of NFLDraftMonsters.com reports that marijuana use is to blame.

"Von Miller is a phenomenal person, but he has a problem with marijuana use," wrote Allbright.