‘Teen was killed, body dismembered by stepbrother, partner’

The couple was arrested for kidnapping on February 28 and two days later, when Watts’ body was found, they were charged with murder.

Matthews denies conspiracy to kidnap and murder, while Hoare denies conspiracy to kidnap, perverting the course of justice, preventing a lawful burial and possessing a prohibited weapon, and murder. Hoare, who was pregnant at the time, denies any involvement.

Donovan Demetrius, 29 – Karl’s twin brother – and James Ireland, 23, are also charged with assisting an offender.

For days, police searched for Watts.

Matthews insisted he acted alone in killing Becky.

“She was suffocated, despite her fighting for her life”.

Prosecutors alleged the couple dismembered and packaged Watts’ body over the course of two days, eventually moving the body parts to a shed near their home with the help of four people.

“In addition to their apparent dislike of Becky, there is good reason to believe there was also a sexual motive behind the scheme, arising from a shared unnatural interest in attractive teenage females, and that a foreseeable conclusion to it being carried out would either be Becky’s death or serious injury”, he added.

A friend of the 16-year-old said Becky had told how Nathan Matthews, 28, had made the threat in 2013. He told police he chose to kidnap Becky to “teach her a lesson” because of how she treated his mother.

The court also heard Shauna Hoare met Matthews when she was 15-years-old.

They then ordered a Chinese takeaway from Laws Kitchen – where Matthews worked – before settling down to watch the television for the night.

The following day, Matthews bought drain cleaner from a shop and a circular power saw, gloves, face masks and goggles from B&Q.

Matthews haggled over the price of a power tool at the till, the court heard. Another couple, who stored the dismembered body in their garden shed, have pleaded guilty to assisting an offender, the BBC reported.

Karl Demetrius and Parsons have both pleaded guilty to their part in concealing Becky’s body parts, but Donovan Demetrius and Ireland deny the charges.

They told the court they “did not know or believe” the bags contained Becky’s body, instead believing it held drugs or clothes.

The prosecutor said DNA associated with Hoare had been found on the inside of a safety mask and on the inside of a knot in a bag used to wrap up Becky’s remains.

Mr Mousley said police found a video clip on a phone belonging to Hoare and Matthews showing the rape of a teenage girl, with her attacker holding a hand over her mouth.

The court heard Becky was reported missing on February 20 by her father and police launched a “full scale investigation”, Mr Mousley said.

Mousley QC tells the court police said Matthews seemed “genuinely concerned” when they responded to the family’s missing person report.

A post mortem examination found Becky was suffocated during a “violent struggle” and suffered 15 stab wounds and a slash across her stomach after death.

Mr Mousley told the court that an expert had concluded that it was “easier to carry out that exercise if more than one person had been involved”.

“The trial heard Becky was 5′ 1” tall and weighed just under nine stone (56 kgs).

The couple arrived at the house that morning and placed her in the boot of the couple’s Vauxhall Zafira.