Targeting could have happened. She was a nurse and was exposed to many ppl in a hospital who might have become infatuated with her. It has happened before to other women. JMO
I'm a person that goes by odds and percentages. In cases like this, 90% of the time its the husband or romantic partner. It is quite odd that a guy who owns a restaurant, and would have to be working extremely long hours, would not be at home until 2:30 AM on a Friday night. Its also suspicious that the three children were not awakened by the attack, but by the husband's reaction to finding the body. It would also be very ballsy for an intruder to break in to a home at night where five people reside. How did he know the husband wasn't home? How did he know the kids were sleeping?
Not that it couldn't have been an intruder, but the odds are telling me this is very likely a domestic incident that is being covered up.