I’ve been wondering about Data & Electrical work (I recall a mention of telecommunications business early on, imo). They may perhaps subcontract to another company.
I’m just thinking about what might regulatory put him in that area, as I think he’s been quite familiar with Sam’s running pattern. He may even have communicated with her. I can imagine there may’ve been various people that Sam encountered over her paths, possibly waved to, exchanged a few words with - but I don’t necessarily think she would have gone back home & talked about these exchanges, as they don’t fall under ‘people she / they knew’.
I just can’t figure out what drove him to do this, as police have labeled it a ‘deliberate attack’, which is so horrible to think about.
All just MO