I am thinking it is either the reporter or Mrs Trinity.
The reporter has already proven that she is willing to sleep with people to get a good story so maybe killing a cop will get her another good story. It is a stretch but maybe they will show a crazier side of her next week showing that killing for her is possible.
As far as Mrs Trinity goes they haven't really shown her much other then last night. It could come out in the next week or so that she knows all about her husband and his dark side and does what she needs to do to protect him (kill the cops looking into him). This one could also work with the Dexter/Rita angle of her eventually finding out his dark side.
Of course by next weeks episode I could be way off and it could just be someone shooting them from in a car.
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