The Nationals have released right-handed reliever Tyler Walker, according to the team's official Twitter feed.
Signed as a free agent Jan. 25, Walker didn't pitch after June 19, a shoulder injury leading to season-ending surgery for a torn labrum. The 34-year-old was 1-0 with a 3.57 ERA in 24 games. He struck out 30 in 35 innings.
There's a chance Walker could be ready to pitch again by spring training, if someone's willing to take a chance on a reliever coming off major surgery, but retirement is also an option for the veteran of eight seasons with the Mets, Giants, Rays, Phillies and Nats.