The Good Guys (2010)

S1E9 Don't Tase Me, Bro

Dan makes a major blunder by unintentionally revealing the identity of a witness in the Witness Protection Program. As a ruthless hitman from a notorious crime syndicate hunts for the witness to silence them, Jack and Dan join forces with a U.S. Marshal. Together, they must safeguard the vulnerable witness and thwart the criminals' sinister plans.