Cops are investigating the gruesome death of a superintendent who suffered a heart attack after he was clobbered with a cellphone during an argument in Brooklyn Wednesday morning, officials said.

The 41-year-old super, whose name was not immediately released, got into a heated dispute with his attacker around 8:12 a.m. inside a building on Ocean Ave. and Glenwood Road in Midwood, and was repeatedly bashed over the head with a cellphone device, police sources said.

Police rushed to the scene, finding the victim with injuries to his head — and that he had suffered an apparent heart attack shortly afterward, cops and sources said. EMS transported the super to Kings County Hospital in critical condition, where he later died.

A person was taken into custody but no charges were immediatel

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