In addition to re-signing Zach Duke, the Nationals have continued to add arms today by signing Bill Bray to a minor league deal, according to Adam Kilgore of the Washington Post (via Twitter).
Bray, 29, was a first-round pick by the Nationals back when they were the Montreal Expos, but was sent to the Reds in an eight-player trade in July 2006. Bray has been in the Reds organization since that deal, up until he elected free agency last month.
Injuries limited Bray to just 14 appearances for the Reds in 2012, but in his last full season (2011), he was effective as a lefty specialist, posting a 2.98 ERA and 8.2 K/9 in 79 appearances.