The death of former national security adviser H.R. McMaster’s father is being investigated as “suspicious” after allegations that he did not receive proper treatment, a report said Wednesday.

H.R. McMaster Sr., 84, died at a retirement community in Philadelphia last week after apparently falling on his head — but staffers at the center have said that records relating to the incident have been falsified, according to WPVI-TV.

Philadelphia police searched the Cathedral Village retirement community, where the incident took place, on Tuesday.

The Attorney General’s Office in Pennsylvania is investigating the possibility of institutional neglect after the elder McMaster fell, according to CBS3-TV.

Cathedral Village said in a statement that they contacted authorities as soon as they were aware of “the alleged incident.”

“We want to reassure you that the safety and welfare of every resident at Cathedral Village remains our utmost priority and we will continue to make every effort to ensure their well-being,” the statement read.

H.R. McMaster Jr. was replaced by former UN Ambassador John Bolton earlier this month.