S3·E22 Judgement Pronounced

A criminal just as he is leaving the courthouse with his lawyer, after beating another rap, is shot by a man driving a car like Dan's and dressed like Dan. Dan is brought in and he can't account for his whereabouts at the time of the shooting. When the witness can't make a positive id, Dan's released and he tries to find out who's impersonating him. Later another criminal is killed and this time the witness says it's Dan.