Census of 1900 - William M. Pierson, Greenville, Hunt County, age 29, born March 1871 in Texas, lawyer, boarder.
FamilySearch .
Judge William Pierson, birth date 3/12/1871 in Upshur County, death date 4/24/1935 in Austin, Travis County, lawyer, Associate Justice of the Supreme Court of Texas.
FamilySearch Texas Deaths, 1890-1976 .
"Murder and Mayhem on the Texas Supreme Court: The Shocking Death of Justice William Pierson and the Evolution of the Insanity Defense in Texas," by Gary M. Lavergne, Volume 4, No. 1, Fall 2014, pp. 20-29.
Journal of the Texas Supreme Court Historical Society .