William Appleby gives details on Walker Lewis's life.

Date: Jun 2, 1847
Type: Letter
Source: William I. Appleby
LDS
Hearsay: Holograph
Direct
Reference: William Appleby, Letter to Brigham Young, June 2, 1847, Brigham Young office files, 1832-1878 (bulk 1844-1877); General Correspondence, Incoming, 1840-1877; General Letters, 1840- 1877; A-B, 1847; William I. Appleby letter; Church History Library, CR 1234 1.
Scribe/Publisher: N/A
People: Brigham Young, Quaku Walker Lewis, William I. Appleby
Audience: Brigham Young; PDF
Transcription: At this place I found a coloured brother by the name of "Lewis," a barber, an Elder in the Church ordained some years ago by Wm. Smith. This Lewis I was informed has also a son who is married to a white girl, and both members of the Church there.
Source Link: https://catalog.churchofjesuschrist.org/assets?id=1784150b-eadf-4286-95a5-3b4cfe142fdb&crate=0&index=0
BHR Staff Commentary
Citations in Mormonr Qnas: Black Saints and the Priesthood (Brigham Young/Early Utah era)
Black Saints and the Priesthood (Joseph Smith era)