I'm not all that electronics savvy, so bear with me. I've just learned that Apple has an App called "
Health App". It comes free with a new iPhone, or you can download it and sync it with your Apple Watch, computer, other phones, etc. One of the features of the app is that it senses and keeps track of the number of steps you take and the kinds of steps that are taken. It can tell if the steps are running steps, walking steps, off-kilter steps, etc. Its not only used for general health reasons, the information gathered can be uploaded to your physician's phone so that he can determine not only the number of steps, but their duration and the type of activity happening while those steps occur.
In a recent case in the UK, a man murdered his wife, staged a burglary and left her phone on the front step of the house to give the impression the burglar/murderers dropped it as they ran away. From the very beginning of the investigation, he insisted she had been murdered during a burglary gone bad. At trial the prosecution used the Health App to demonstrate the movements of both the husband and wife's phone during the time they suspected he murdered her. Her phone was casually walked 14 steps from the front door to where it was found by police on the front steps. His phone mirrored the same. His phone walked back into the house. Hers did not. During the time period when the burglary was staged, his phone indicated frantic movement around the house as he tore the place apart after her murder and attempted to cover his crime. The information helped sentence him to a life tariff.
If Gabby and BL had iPhones, they most probably had this app and used it to keep track of their steps walked from day to day. I would be VERY interested to see the charts of those movements around the time of Gabby's death. If she was attacked and strangled, or bludgeoned with a rock, or knifed - that struggle and the steps associated with it and the nature of those steps would be recorded on her Apple Watch or phone, if she had it in her pocket. The same would be recorded on BL's watch or phone.
Amazing.