Former Chicago Bears linebacker Brian Urlacher announced his retirement from the NFL via Twitter on Wednesday, three days shy of his 35th birthday.

“After spending a lot of time this spring thinking about my NFL future, I have made a decision to retire,” Urlacher wrote in a statement. “Although I could continue playing, I’m not sure I would bring a level of performance or passion that’s up to my standards. When considering this, along with the fact that I could retire after a 13-year career wearing only one jersey for such a storied franchise, my decision became pretty clear. I want to thank all of the people in my life that have helped me along the way. I will miss my teammates, my coaches and the great Bears fans. I’m proud to say that I gave all of you everything I had every time I took the field. I will miss this great game, but I leave it with no regrets.”

The Bears announced in March that the sides made the decision to go in a different direction after a contract could not be worked out for the free agent. Urlacher said at the time it was more of an ultimatum from the team than anything else. No other offers, if there were any, became public.

So, Urlacher walks away from the NFL following a distinguished career in which he was a longtime captain for the Bears, winning NFL defensive rookie of the year and defensive player of the year honors.