Becky Watts murder trial: Stepbrother and girlfriend 'chopped up teenager with knife and power saw'
The step-brother of Becky Watts admitted to police he wanted to kidnap her to teach her a lesson because she mistreated his mother, a court heard.
Nathan Matthews, 28, had driven with his girlfriend Shauna Hoare, 21, to the 16-year-old's home in the St George area of Bristol with a bag containing a stun gun, handcuffs, tape and a mask.
But after knocking on the teenager's bedroom door, his mask slipped during a struggle - revealing his true identity - so he strangled his petite step-sister.
He then put her body in his Vauxhall Zafira car, drove her the short distance to his home in Barton Hill, before dismembering her body in the bath and later hiding the remains in a garden shed.
William Mousley QC, prosecuting, explained to the jury what Matthews had told detectives after his arrest for Becky's murder.
"He said Shauna gone into the garden and he went to the car and got the bag. He went and knocked on Becky's door and when she opened it he was already wearing the mask," Mr Mousley said.
"He said there was a short struggle and during it his mask had slipped, so she could see him, so he put her in the bag and strangled her."
He said he put Becky's phone, laptop and some bedding and clothing into the bag and placed it in his car.
"He said he waited until Shauna had gone to bed before putting the bags into the house," Mr Mousley said.
"He moved the bag containing Becky's body and put it in the bath. He said he cut up her body with the circular saw, wrapping up the body parts, carrying them downstairs and hiding them."
Matthews told police that days later he took Becky's body parts to 9 Barton Court with two other people, who he would not name, and promised to collect them a few days later.
"He stated that Shauna Hoare didn't know anything about what he had done because if she had known he believed she would have called the police," Mr Mousley said.
Hoare denied all knowledge of Becky's death and stated she had no interest in kidnapping teenage girls.
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