15:15KEY EVENT
Tustin: "I didn't kill Arthur"
Mr Hankin asks how in the space of 14 seconds Arthur could have moved from his prone position shown in the photograph taken by Tustin, to a position where he could have got up and fallen from the stairs.
Tustin: "I don't know. I didn't know I was going to have to account for every second."
She adds: "He definitely moved because I heard a bang and a crack and wasn't there. He definitely moved somehow."
Mr Hankin: "When are you going to tell the jury what you did, when are you going to admit killing Arthur?"
Tustin: "I didn't kill Arthur."
Mr Hankin says even if Arthur had somehow got to the top of the stairs and jumped down, it would not have caused his fatal head injuries.
Tustin: "I was not near Arthur. I didn't kill him."
Mr Hankin: "How do you account for his injuries and death?"
Tustin: "I can't account for it. I was not there. I didn't see it. I just heard it."
Mr Hankin: "You have nothing else you can say?"
Tustin: "No I do not."
15:16CARL JACKSON
Court shown body-worn camera footage of Tustin speaking to police
The court is shown the body-worn camera footage of Tustin speaking to police outside her home on June 16 after Arthur had collapsed.
Mr Hankin asks why Tustin told officers at that time that Arthur had banged his head and knocked himself unconscious while she was in the hallway trying to hold him.
Tustin explains she was in shock at what had just happened.
Mr Hankin: "You lost your temper with Arthur didn't you, you bashed his head against the concrete floor and then waited for 12 minutes or more before phoning the emergency services."
Tustin denies the first two parts of the statement but accepts she waited 12 minutes because Arthur was breathing and had a pulse.
Woman 'doing her eyebrows' at time she's accused of poisoning boy - updates