Philadelphia authorities are investigating the death of the father of former White House national security adviser H.R. McMaster, ABC 6 reports.

According to the Philadelphia Department of Public Health, the former official's father, H.R. McMaster Sr., died on April 13 of blunt force trauma to the head.

While health officials have ruled his death to be an accident, investigators have labeled the death suspicious and are looking into whether there could have been institutional neglect in treating him by the retirement community where he lived.

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The 84-year-old Korean War veteran reportedly did not receive proper care at the Cathedral Village retirement home, where he was living after suffering a stroke.

The Philadelphia police's homicide unit is looking into allegations that McMaster Sr. had fallen and was placed on a chair and neglected. Employees also reportedly told the McMaster family that records related to his death had been falsified.

Police are investigating the death as suspicious and have obtained a search warrant for the retirement community.

McMaster left the administration earlier this month, where he was replaced by former U.S. Ambassador to the United Nations John Bolton after reports that President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE and McMaster disagreed on certain policy issues.