Their child appears to have been at Becky's home with NM & SH:
The jury was told that on the day Becky was killed it was raining heavily. At 10.50am Matthews and Hoare left their home and stopped at a supermarket to buy batteries. Possibly for a stun gun, said Mousley.
At 11.03am Becky sent her last text message, to her boyfriend. Mousley said that in all probability Becky was killed and her body dumped in the boot of Matthews and Hoares Vauxhall Zafira car.
CCTV footage showed Matthews and Hoare driving home to Cotton Mill Lane with a child sitting in the rear of the car. They arrived home shortly after 6.40pm. Beckys dead body was in the boot, Mousley said.
http://www.theguardian.com/uk-news/...killed-in-sexually-motivated-attack-jury-told
Also, thinking something may have gone wrong with the stun guns and they may have been unable to use them. Evidently, Becky fought hard for her life.