Following the murder of 18-year-old Juanita Mott in April 1975, Fred concreted over the floor of the entire cellar. He later converted this section of the household into a bedroom for his oldest children, and he and his wife are not known to have committed any further murders until May 1978, when Fred—either with or without Rose's participation but certainly with her knowledge—murdered an 18-year-old lodger named Shirley Robinson. Robinson had first met Fred at The Green Lantern café in April 1977, and had taken lodgings with the Wests the same month. She was heavily pregnant at the time of her murder. Although Rose—herself pregnant at the time—initially boasted to neighbours the child Robinson was carrying was her husband's; she soon developed a deep resentment of Robinson, and the motive for her murder is likely to have been the removal of a threat to the stability of the Wests' relationship. Her body was buried in the garden of 25 Cromwell Street. It was extensively dismembered, but no restraining devices were found with these remains, making a sexual motive for this murder unlikely. The unborn baby had been removed and had several bones missing. Shortly thereafter, Rose unsuccessfully submitted a claim for maternity benefit in Shirley's name with Gloucester social services. As had earlier been the case with Charmaine and Lynda, Fred and Rose allayed the suspicions of anyone who asked about Robinson's whereabouts by claiming she had relocated to live with her father in West Germany.