There have been claims that rigor mortis is visible in photographs of Nevill, June and the twins, and that those of Sheila Caffell show no rigor or lividity. This claim does not seem ever to have been adduced by a medical professional rather than a layperson.
Officers observed that wet blood had pooled in the crook of Sheila’s right arm. Congealed blood had also formed in the aperture of the lower neck wound. One possibility is that when Sheila was moved by officers at the scene, this plug became detached, and allowed blood accumulated within Sheila’s neck, viscous but not yet congealed, to run thickly beyond the entrance of the wound.