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Houston police are reporting an in-flight death aboard a United Airlines flight from Denver to Houston.

According to authorities it was at around 9 p.m. that the man reportedly collapsed in the aisle of the plane and CPR was administered. When the flight landed at about 11 p.m., Houston Fire Department met the flight at the airport and the man was pronounced dead.

The cause of death is still unknown at this time.

More: KHOU