I don't see where Borth will fit into the cast as a regular. As in any crime drama, the lead actor and actress always slowly build up romantic interest through the series. They work together and secretly have feelings for eachother. They try topush their feelings away but at the end of the series they always end up together.It adds to the show and keeps viewers interested. It's become very cliché in crime dramas, but it always works and personally i love it. I don't see how this will work since Steve and Catherine are already together. The "romantic interest" idea can't work in this case because the 2 have already been together and they can't slowly fall in love throughout the series.There won't be any tension, suspense, or that "Oh my gosh when will they finally kiss?!?!" feeling. Unless the writers have a different role in mind for Borth, I think this move will be a flop.