PHILADELPHIA (CBS) – Authorities in Philadelphia are investigating the death of the father of President Donald Trump’s former national security adviser, sources tell CBS3.

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According to the Philadelphia Department of Health, H.R. McMaster Sr., the father of Gen. H.R. McMaster, died on April 13 at the Cathedral Village Retirement Community located in the 600 block of East Cathedral Road.

The health department confirms he died of blunt impact trauma to the head and the manner of death was determined to be an accident.

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But sources tell CBS3 that Philadelphia police and the Pennsylvania Attorney General’s Office are investigating the possibility of institutional neglect after he fell.

“We are working closely with the Philadelphia Police Department to thoroughly and carefully review this tragic incident. This investigation is in the very early stages,” says the attorney general’s office in a statement.

Sources could not provide further details at this time.

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CBS3 interviewed H.R. McMaster Sr. in 2017 when his son became the national security adviser.

“I’m very proud of him and he has never disappointed anyone who knows him or who he’s ever served with,” McMaster Sr. said.

Gen. McMaster served under Trump as the 26th National Security Advisor. In April, he resigned from his role and was replaced by former U.S. Ambassador John Bolton.

Cathedral Village has not responded to requests for comment.