In a game against Tennessee, he tore three ligaments in his knee on a hit that left his lower-leg dangling in the wrong direction. It was his second catastrophic injury in two years.
Two weeks ago, Lattimore was picked in the 4th round of the Draft.
The NFL followed around Lattimore on draft day and made this video.
It's fantastic, and gives you a good idea of the emotional toll Lattimore's roller-coaster ride to the NFL took on him: