Double Tap by Steve Martini (2005)

is a murder mystery featuring Paul Madriani and a not very talkative defendant with a seven years gap on his military resume, maybe even suffering from post-traumatic stress disorder. The name of the book comes from a military shooting tactic of two bullets fired in rapid succession. The victim's company receives significant contract from 3 letter government agencies. Doors are being closed on many things in the name of "national security". The description of court room proceedings is excellent, featuring a midget DA, who yet to lose a capital murder conviction. And the conclusion is very surprising (although one may consider it a bit abrupt).