Pratt was re-elected to the legislative assembly of the State of Deseret in the winter of 1850, returned again by unanimous vote in August 1854, and in 1855 served as chaplain of the council as it sat in assembly in Fillmore. He also served as a regent for the University of Deseret.
Pratt was called on a mission to the southern states and while he was on this mission, a lawsuit was filed by one Hector McLean, who accused Pratt of causing an estrangement between himself and his former wife, Eleanor. Although Pratt was exonerated by the court, McLean and two accomplices pursued Pratt to Alma, Arkansas, where they fired at and stabbed him. He died on 13 May 1857 and was quietly buried at what is now Fine Springs, Arkansas.
See: Parley Parker Pratt, Autobiography of Parley Parker Pratt (1985); Parley Parker Robinson, The Writings of Parley Parker Pratt (1952); Peter L. Crawley, The Essential Parley P. Pratt (1990).
Donna T. Smart