According to the Daily Star, Niall's (Barry Sloane) revenge plot against his oblivious family reaches a dramatic climax in October when he kidnaps the whole McQueen clan, including his mother Myra (Nicole Barber-Lane), who left him in a church after giving birth to him when she was 14.
In an ironic twist to the storyline, Niall captures his unwitting family and takes them to an abandoned church, blowing it up with them still inside. One of his sisters - Carmel (Gemma Merna), Mercedes (Jennifer Metcalfe), Tina (Leah Hackett) or Jacqui (Clare Cooper) - will not make it out alive.
An insider told the newspaper: "Sadly, one of the girls decided they had had enough and told producers that they wanted out. So what better way than to be blown up in one of the most shocking plotlines of the autumn?
"Regardless of who it is, fans are going to be gutted, as the McQueen sisters are some of the most popular characters on the show."
They added: "All that can be revealed at the moment is that there is plenty of blood and a huge explosion. And one of the McQueen clan is murdered."