Found Killinger among my Smith notes of Lebanon County, PA.Don't know if this is of any relation to your David Killinger, but it might be a lead for you.
Abstracts of Wills taken from Lebanon County, PA 1813-1827 in Will Book-A, Page 80.Written 5 May 1804 and recorded on 8 Aug 1815.(note: Lebanon County was formed in 1813)
Michael Killinger of Annville Twp. Dauphin County, PA.
Sons:Andrew, Peter, Michael P., David, John, George, and Jacob.
Daughters: Margaret (David Smith), Elizabeth (Christian Early), Catharine (Nicholas Palm), Mary (Michael Dininger), Molly (John Heilman).
Grandchildren: Peter Smith, Catharine Smith, Margaret Smith, David Smith, John Smith, Mary Smith, Sally Smith, Molly Smith, Michael Smith, Elvira Dininger, Mary Dininger, Catharine Dininger, Rosanna Dininger, Michael Dininger.
Also among the burials at Hill Lutheran Church are:
Killinger Michael15 May 1731 - 11 Jul 1815Veteran of Rev. War.
Killinger Catharina (wife of Michael) d. 8 Feb 1804 (age 63 years).