I too have been puzzeled by the insistance of many that David's wife was Elizabeth Berry. I believe his wife was Elizabeth Crigler. Otherwise Christopher Crigler's will makes no sense.
Culpeper VA, May 30, 1809, in Will Book F, page 119
Will of Christopher Crigler
"All debts of which there are few and none of magnitude are to be paid promptly, and my will carried out. I bequeth to my daughter Elizabeth Taylor one hundred acres of land, corner to John Finks. I have no money to pay for her being security for her administration of estate of David Yowell, deceased. If I have any money to pay on account it must come out of this I leave her and her daughters."
The murder of Nancy Clark (alias Nancy Bryant) occured 30 Sep 1792.
David Yowell and Michael Klug were indicted 1793
David Yowell died before his will was presented for probate 26Dec 1793.
His widow remarried:
Virginia Marriages to 1800 Taylor, John married Yowell, Elizabeth on 26 Nov 1794 in Madison County, Virginia
The evidence strongly suggests that David's wife was the d/o Christopher Crigler.