He walked in, saw his ex was working. He returned to car, got gun. He walked in, called her name to get her attention. He shot her, Coworkers, and those who tried to intercede/help. His family has now come forward. He fled in his car. The “Hispanic in grey” was simply a similar ethnicity person who was fleeing the carnage.
Read into it if you will but I just watched the KOMO newscast. It showed the investigation scene and HSI (Homeland Security Investigations was there). Their jurisdiction is Immigration and Customs.
Religion of Pieces “Honor Killing”. The other victims were simply infidels who got in the way.