FILE - In this Dec. 20, 2012, file photo, Buffalo Bills linebacker Shawne Merriman (56) walks on the field before an NFL football game against the New York Jets in Orchard Park, N.Y. Merriman is calling it "Lights Out" on his career, announcing on his website, Tuesday, March 5, 2013, that he plans to retire. AP Photo/Bill Wippert, File BUFFALO, N.Y. (AP) - Linebacker Shawne Merriman is calling it "Lights Out" on his career. The three-time Pro Bowl selection and 2005 NFL Defensive Rookie of the Year said on his website Tuesday night that he intends to file retirement papers. "I retire today not because I don't feel I can go out there and still play the game at a very high level," Merriman wrote. I am retiring because I want to retire on my own terms and leave while I know I can still physically play the game. The 28-year-old Merriman also posted a note on his Twitter account, which included a link to his website (shawnemerriman.com). "I have a very Big announcement," Merriman wrote. Thanks everybody. The decision comes a week before he was eligible to become a free agent, and after spending parts of the past three seasons in Buffalo. That included last year, when he was cut by the Bills in August only to be re-signed by Buffalo in October to help address the team's injury-riddled defense. Merriman had expressed surprise he went unsigned for the first six weeks of last season. He finished the year with 17 tackles and one sack in 10 games, including one start. That was a marked drop-off for a player who became an instant NFL star after being selected by San Diego 12th overall in the 2005 draft. Combining for 39 1/2 sacks in his first three seasons with the Chargers, Merriman earned the nickname "Lights Out" as one of the league's fiercest pass rushers. A series of injuries, however, caught up to him, and he was particularly bothered by a sore right Achilles tendon. It's an injury that led to the Chargers waiving him during the 2010 season. The Bills acquired his rights soon after, but Merriman never made it past his first practice in Buffalo after aggravating the injury. He was limited to playing five games in 2011 before being placed on injured reserve to have surgery on the tendon. Merriman was limited to 18 games over his final three seasons. And he finished with 45 1/2 career sacks in 75 games, including 59 starts. In thanking his fans and two former teams, Merriman said he intends to pursue other career opportunities. Merriman has dabbled in acting, is a fan of kick boxing and wrestling and has also worked as a model. "I feel truly blessed to have been part of the NFL, and to have had the opportunity of a lifetime," Merriman wrote. I will continue to train with some of the guys not because of football, but it's part of my Lifestyle.