ALERT - COULD BE A SPOILER IF YOU ARE NOT UP TO DATE WITH WATCHING THE EPISODES.
I've had a thought..... (as my dh would say - 'did it hurt', he thinks he's funny 
I'm referring to the closing scenes of last night's episode.
I think the mother only had the word of the son for what he 'did', yes I know there is all sorts of circumstancial evidence i.e. the bump on the car...
But the son is clearly very disturbed, voices, previous psychotic episodes.
And what purpose have these characters served in the storyline so far.... it would be the police tracng the car paint, finding the son did the murders and he's already dead. ?? To me this doesn't seem a good enough ending.
Methinks perhaps mamma might have been a bit ahead of herself with the rifle.