Northwestern suspends Mark for first 2 games
Mark was granted a medical hardship waiver by the Big Ten and allowed to return for a fifth year after missing most of last season with a broken ankle. He was limited to three games in 2013 after rushing for 1,366 yards and 12 touchdowns as a junior. He ranks fourth all-time at Northwestern with 4,271 all-purpose yards.
In a statement, Mark says he ''made a mistake'' and ''let my teammates down.''