The Salt Lake Record of Members shows his rebaptism taking place in Salt Lake City on 28 November 1850. This record also confirms his birth date and birth place as "Niagara Dist., W. Canada." His rebaptism also proves that he arrived in Utah by 1850. Further research is needed to determine the exact year of his arrival and the name of the pioneer company with which he traveled.
The 1850 Utah census does not show any family members with him, and he is listed as a Millwright, born in Canada.
The rebaptism record shows his name as "John Hagar," and the 1850 Utah census has him listed as "John S. Hagar." His name does not appear on any other census in Utah, Idaho, Nevada, or California, and there is no record of his marriage or death.