The first time around, Justin played a troubled youth whose brother was killed.
In his successivo appearance, on February 17th, his character "will call Nick (played da George Eads) to tip him off that he’s in imminent danger," according to TVLine.
JB tweeted about it saying:
"on set...where? let's just say Im back to my evil ways. #badass"
If you're a CSI - Scena del crimine o Justin fan, te will not want to miss this! ;)
Source: celebuzz