Five persons were detained in connection with the attack on the hospital late Tuesday night, the police said.
The hospital authorities lodged a complaint with Salt Lake police station and family members of the deceased also lodged a complaint against the hospital alleging medical negligence and inflated bill, an officer of Lake police station said.
"We are looking into the matter and investigation is on. We are speaking to the hospital authorities and looking into the complaints of the affected family," he said.
Her family members had been intimated of her critical condition on a regular basis as per the hospital norms, a statement released by the hospital said.
The patient died last night due to macrophage activation syndrome with multi-organ failure from dengue fever, it said.