... September 30, 2007 there was a pop that was heard around the N.F.L. world. Marvin Harrison injured his knee while attempting a block against a Bronco’s player. Though no one knew it at the time, that injury was to lead to the end of Harrison’s career.

In typical Colts fashion, little was released about the severity of Harrison’s injury or when he would return. One week after another the fans were told it would be soon, that he’s coming along, we expect him to start practicing any day, then it was we’ll see how many days of practice he can get through, then it was we think he's going to play, and finally, we decided to hold him out.

Bleacher Report - NFL