From the "Geschichte der Family JÜNGST" (History of the JÜNGST Family'), by Dorothea v. CHAMISSO, 1993:
Kathrina Elizabeth KNECHT, daughter ofPeter KNECHT, married Johann Heinrich JÜNGST 13 November 1853 at Roth. Johann Heinrich was born 9 May 1827 in Herborn, Hessen-Nassau.He died in the USA, date and place uknown. They had at least one child, born 15 February 1854 in Herborn, who apparently died very young.
I don't know when Johann Heinrich came to the US nor do I know if Kathrina came with him. Possibly she died in Germany.
I would like to hear from anyown that might know about this family.