Becky Watts murder trial: Live updates as killer stepbrother continues giving evidence for third day 29 OCTOBER 2015 The jury heard how Avon and Somerset police officers arrested Matthews on February 28. Prosecutor: So the plan failed didnt it. Matthews: Not completely. Prosecutor: You and her were both in it together from start to finish. Matthews: No, not to start, not to finish - not anything. Thats what you are trying to suggest. Prosecutor: But you had a fall back plan with Shauna. Matthews: No. Prosecutor: Did you tell Shauna that out of your love for her you would take it all on your shoulders? Matthews: No that would be highly suspicious. I didnt want to row out Shauna - Shauna had nothing to do with it. The prosecutor said Matthews had tried to get off as lightly as he could himself - while enabling Shauna to get away with it.