Frank Alexander suspended one year for violating substance abuse policy

CHARLOTTE, N.C. -- Carolina Panthers defensive end Frank Alexander has been suspended for one year for violating the league's substance abuse policy.

It is the third suspension for Alexander, who suffered a season-ending Achilles injury during a preseason game against the Miami Dolphins.

Alexander was suspended the first four games of last season and then 10 more for a second offense. Carolina's 2012 fourth-round pick admitted earlier this year that marijuana use was the reason for last season's suspensions.

Alexander was set to become a restricted free agent in March.

Alexander is the third Carolina player to be suspended by the league in two days.

On Monday, backup defensive end Wes Horton was suspended for four games for testing positive for taking performance-enhancing drugs, a league source said.

Wide receiver Stephen Hill, who suffered a season-ending knee injury in training camp, was suspended for one game after he was cited for possession of drug paraphernalia during a traffic stop in July.