Carolina Panthers defensive end Jared Allen is calling it a career.  He posted a video on Twitter in which he said this was the part where he was supposed to ride off into the sunset, but since there is no sunset, he's just going to ride off.  Allen then galloped away on a horse. 

The 33-year-old led the NFL in sacks in both 2007 and 2011 and had been the NFL's active leader with 136.  Allen played 12 seasons with the Chiefs, Vikings, Bears and Panthers.