His wife's obituary states that she came to Utah in 1864. Their son, Edward, was born in Missouri in March 1864, and daughter Julia was born in Salt Lake City 2 May 1866, which was prior to the arrival of that season's emigration. Further research is needed to determine the name of the pioneer company that the family traveled to Utah with.
William's obituary confirms his death date. His name is listed as "William Knowel" on the 1870 Utah Census.