You have Catherine Whitenight marrying John Frederick Nagle/Nagel in Columbia County, PA.If I'm reading correctly, you then have John Frederick Nagel dying and Catherine remarrying John Hittle.
Having been to Vanderslice Cemetery in Columbia County (Buckhorn area) I can tell you that several Whitenights are buried there.I wasn't looking for Whitenights, so I have no clue as to whether or not your John/Frederick is there, but it wouldn't surprise me if that might be a very good possibility.
What I am looking at from your post is hoping that you might have more information on John Hittle.time frame? children? John Hittle's linkages?