Marc Savard – Boston Bruins
Marc Savard was on fire, he was loved by fans, and was a monster on the ice but during his time with the Boston Bruins, Savard’s career came to a tragic end. He was hit by the Pittsburgh Penguins Matt Cooke, and sustained a severe concussion. He returned for the 2010 postseason, suffered yet another concussion in January 2011 and didn’t play for the rest of the season. Doctors diagnosed him with post-concussion syndrome, forcing him to retire, and he is still suffering from the syndrome.
Marcus Lattimore – San Francisco 49ers
When Marcus Lattimore played for the University of South Carolina, he was a pretty impressive player and was eventually drafted by the San Francisco 49ers. Then in 2011, in a game against the Mississippi State Bulldogs, Lattimore tore his knee ligament and announced he would miss the remainder of the 2011 season. In 2012, he attempted a comeback but during a game against the Tennessee Volunteers, he dislocated his right knee and torn every single ligament, damaging the nerve. Not long after surgery, he declared himself eligible for the NFL Draft.