In 1850 Winnebago County was formally divided into townships. In an election held April 2, 1850 Mack ran for the position of the first Township Supervisor of Rockton and was narrowly defeated by Sylvester Talcott. Six days later on the following April 10 Mack died suddenly of unknown causes (rumors circulated for years that he was poisoned). Land for the Rockton Cemetery was donated to the village by one of the Talcott's, and Mack refused to have his own family members buried there. Mack, Hononegah and one of their sons were buried in a cemetery which is near the present golf course club house and is marked by a boulder with a memorial plaque.