Teenager Becky Watts was murdered and then her body cut up with a knife and a power saw by her stepbrother and his girlfriend because of their "shared unnatural interest in attractive teenage females", a court heard.
The 16-year-old was killed in the bedroom of her home in Bristol by Nathan Matthews, 28, and Shauna Hoare, 21, on February 19 this year, jurors heard.
The pair then "there followed a deliberate, carefully planned and grotesquely executed plan to cover up her killing", prosecutor William Mousley QC told a jury of one man and 11 women at Bristol Crown Court.
Mr Mousley said: "On Thursday February 19, Rebecca Watts, known to all as Becky, aged 16, was killed in her bedroom.
"She was suffocated, despite her fighting for her life. There followed a deliberate, carefully planned and grotesquely executed plan to cover up her killing.
"Following her removal from her home, over the course of the next few days, her body was cut up with a knife and a power saw, the parts carefully packaged and then moved to another address to prevent them being found and lawfully buried, where they were intended to be stored probably temporarily until a final solution could be found.
"Nathan Matthews and Shauna Hoare were responsible for her death and that cover-up, assisted by four others, acting together, including James Ireland and Donovan Demetrius, who, to varying degrees over a period of a week, helped in the hiding of her disguised remains in the knowledge that she had been killed or that some other significant offence had been committed by Nathan Matthews and intending that it should prevent the apprehension or prosecution of Nathan Matthews and Shauna Hoare."