Shoppers  stocking up on salt and shovels  at the Chelsea Home Depot ducked and then ran for their lives when a disgruntled worker fatally shot his boss -- and then turned the gun on himself Sunday, police said.

“Both persons are deceased,” Det. Steven Wren said outside the chain’s flagship store on W. 23rd St. The store was shut down as emergency vehicles converged on the chaotic scene.

The NYPD did not immediately identify the two but the Daily News and The Post, citing law enforcement sources, said the shooter was Calvin Esdaile, Jr., of Brooklyn, who was pronounced dead at the scene.

The slain supervisor was rushed to Bellevue Hospital, where he also died.

Witnesses described a scene of utter chaos as shoppers stocking up ahead of the coming blizzard ran for cover.

“I heard some shots towards the back of the store. It sounded like four or five,” a worker told The Post. “I heard someone yell, 'Oh, my God, he’s dead!' Everyone was running and screaming and ducking."

There as no official count on just how many customers hightailed it to the streets but 70 workers were on site, the NYPD said. Still in their trademarked orange aprons, many of the shellshocked employees hugged each other and wept.

The .38-caliber revolver used in the shooting was reportedly recovered at the scene, which sources told reporters happened in Aisle 12 - the lighting aisle.