It was all about a corn queen that had been killed (possibly called Mary???) and there was a whole who dunnit around finding the murderer.
IIRC the murderer was a police officer and I do remember a scene where the son and the police officer were at home on the xbox and he was acting all shifty with a big duffel bag that he'd brought home a bit earlier.
I originally thought it was broadcast in 2014 but now I'm not sure although it has to be between 2012-2014
PLEASE someone remember this show as it's been bugging me for a while 