William died before Revolutionary War pensions were started and as far as I have been able to determine no roster exists proving his service. However, the ancestry.com web site has two references that establish his service:

1. Name: William Stallworth
Cemetery: Edgefield Dist Cem
Location: Edgefield Co SC 59
Reference: Abstract of Graves of Revolutionary Patriots, Vol.4, p. Serial: 12260; Volume: 5

2. William Stallworth is listed in Volume 73 on page 281 in the Lineage Books of the National Society of the DAR