I'm not suere the husband is usually in the store this time...
I didn't hear that he went for mincha anywhere, besides here. and btw it was quite early for mincha...
From NYT,
"Moishe Ferencz, the owner of the market, JC Kosher Supermarket, had just left his store to take a quick break at a nearby synagogue, according to his mother, Victoria Ferencz. After a couple minutes, shots rang out. The synagogue was put on lockdown, and Mr. Ferencz’s thoughts turned to his wife, Mindy.
She had been left tending the market."