He died of consumption.

Power of Attorney
Know all men by the presents that I Denison Hilliard of the Town of Pharsalia County of Chenango State of N.Y. do constitute and appoint Denison H. Hilliard of the same place my true and Lawfull Attorney for me and in my name to grant bargain and sell let out or lease all and any land to wich I have title or claim by devine gift grant or otherwise, lying and being in the State of Connecticut and make entry on the same and to give and execute deed or deeds leas or leases receive rents and do all necessary things in my name by such or otherwise as fully and absolutely as I myself could or might do In which where off I have hereunto set my hand and seal this 22d day of June 1829. Denisan Hilliad