Apologies in advance if this has been posted elsewhere but I've trawled through the Cathay threads and can't find the information.

I've booked one of the cheap DAD-JFK-DAD flights. My return to DAD goes through HKG. I'd like to fly home to London from HKG. If I don't take the HKG-DAD leg, will they release my luggage without repricing the ticket?