If this Saul Centers owns Home Depot and Michael's, then there is a consolidated credit card/customer file.
If they were killed AFTER the purchases, then their use of the CC (and their location )could be relayed to a shooter - same if you used a CC to pay at the pump, although I think the gas station shootings are more random.
Also! I am not a culprit anywhere - last name is Culp.
Where does THAT come from??
Wonder if he was using his dad's credit card for a purchase?