Major supermarket chains are beginning to report their first coronavirus-related employee deaths, leading to store closures and increasing anxiety among grocery workers as the pandemic intensifies across the country. A Trader Joe’s worker in Scarsdale, N.Y., a greeter at a Giant store in Largo, Md., and two Walmart employees from the same Chicago-area store have died of covid-19, the disease the novel coronavirus causes, in recent days, the companies confirmed Monday. Though more than 40 states have ordered nonessential businesses to close and told residents to stay home to stem the spread of the virus, supermarkets are among the retailers...