I know that David Walker died in Highland Co., Ohio April 6, 1842. I'm not sure if this is your David or not.....I went to Cincinnati OH and found record of this David and his wife Lydia applying for pension from the war.....She was denied due to lack of proof of service....Apparently David paid someone else to go in his place....I would love to find out about this man...I have very little information about his past...I have found all kinds of records of him in OH.